All power banks are evaluated based on Test Methodology using the same scoring tables, but not every metric matters equally for every power bank category. Therefore to maintain a degree of fairness, we introduced the Category Weighted Matrix for each metric scored under each pillar, based on the main category this power bank was designed for.
While every pillar uses the same scoring scale, their importance differs by category:
- Laptop-class power banks emphasize displays, pass-through charging, and port clarity
- Wireless power banks emphasize magnetic strength and silent operation
- Slim & lightweight models emphasize attached cables and simplicity
- Rugged/solar models emphasize lighting and usability in poor conditions
This keeps the system fair and honest.
Changelog
- 14 Feb 2026: Published
- 28 Mar 2026: Added Category-Aware Weighting
Efficiency
The balance between low-load optimization, high-load brute force, and chemical density.
A Laptop bank’s efficiency score is dictated by its high-wattage performance and density. Wireless and Solar banks sacrifice wired efficiency weights to accommodate their specialized charging tech.
For more information on how efficiency is weighted, see Category Weighted Matrix.
All power banks are evaluated against the same set of discharge tests. With the main data for consideration being:
The DC-DC conversion efficiency under a light load of 10W, simulating the charging of a standard smartphone, smartwatch, or wireless earbuds. High-wattage power banks often score lower here due to the “overhead” power required to keep their complex circuitry awake.
| Score | Criteria | Implication |
|---|---|---|
| 10 | > 85.0% | Exceptional low-load optimization. Almost zero energy wasted as heat. |
| 9 | 82.0% – 84.9% | Premium tier. Highly efficient buck/boost conversion. |
| 8 | 79.0% – 81.9% | Above average performance. |
| 7 | 76.0% – 78.9% | Solid performance for standard EDC power banks. |
| 6 | 73.0% – 75.9% | Acceptable energy retention. |
| 5 | 70.0% – 72.9% | Industry standard. Typical for high-power (140W+) banks idling at 10W. |
| 4 | 65.0% – 69.9% | Noticeable energy waste. The unit likely feels warm even at 10W. |
| 3 | 60.0% – 64.9% | Highly inefficient circuitry or chemically degraded/old battery cells. |
| 2 | 50.0% – 59.9% | Half of the rated capacity is lost to heat and poor components. |
| 1 | 40.0% – 49.9% | The battery inside is smaller than advertised. |
| 0 | < 40.0% | Fraudulent capacity claims or catastrophic cell failure. |
The efficiency when the unit is pushed to its absolute advertised limit (e.g., 65W, 100W, 140W). Because power banks often output at higher voltages (20V/28V) for these tests, the internal conversion can sometimes be more efficient, but thermal losses are higher.
| Score | Criteria | Implication |
|---|---|---|
| 10 | > 85.0% | Exceptional low-load optimization. Almost zero energy wasted as heat. |
| 9 | 82.0% – 84.9% | Premium tier. Highly efficient buck/boost conversion. |
| 8 | 79.0% – 81.9% | Above average performance. |
| 7 | 76.0% – 78.9% | Solid performance for standard EDC power banks. |
| 6 | 73.0% – 75.9% | Acceptable energy retention. |
| 5 | 70.0% – 72.9% | Industry standard. Typical for high-power (140W+) banks idling at 10W. |
| 4 | 65.0% – 69.9% | Noticeable energy waste. The unit likely feels warm even at 10W. |
| 3 | 60.0% – 64.9% | Highly inefficient circuitry or chemically degraded/old battery cells. |
| 2 | 50.0% – 59.9% | Half of the rated capacity is lost to heat and poor components. |
| 1 | 40.0% – 49.9% | The battery inside is smaller than advertised. |
| 0 | < 40.0% | Fraudulent capacity claims or catastrophic cell failure. |
How much usable power you carry per gram of weight. It exposes heavy, inefficient devices and rewards advanced cell chemistry.
| Score | Criteria | Implication |
|---|---|---|
| 10 | > 210 Wh/kg | Raw Li-ion efficiency. Zero dead weight. |
| 9 | 190 – 209 Wh/kg | Ultra-lightweight casing with premium cell density. |
| 8 | 170 – 189 Wh/kg | The sweet spot for high-quality “Slim” category devices. |
| 7 | 150 – 169 Wh/kg | Industry average for standard 20,000mAh units. |
| 6 | 135 – 149 Wh/kg | Slightly heavy; acceptable for feature-rich devices. |
| 5 | 120 – 134 Wh/kg | Heavy. Typical for banks with large screens, thick cables, or aluminum heat sinks. |
| 4 | 105 – 119 Wh/kg | Noticeably heavy for the power it provides |
| 3 | 90 – 104 Wh/kg | Probably uses older, cheaper, and heavier 18650 cells. |
| 2 | 81 – 89 Wh/kg | Obsolete technology. A burden to carry. |
| 1 | 75 – 80 Wh/kg | Obsolete technology. A burden to carry. |
| 0 | < 75 Wh/kg | Contains literal dead weights (e.g., iron plates) to fake a premium feel. |
The efficiency of the induction coils. Wireless charging produces immense heat, leading to massive energy loss.
| Score | Criteria | Implication |
|---|---|---|
| 10 | > 70.0% | Flawless magnetic alignment (Qi2/MagSafe) with excellent heat dissipation. |
| 9 | 67.5% – 69.9% | Top-tier wireless performance. |
| 8 | 65.0% – 67.4% | Top-tier wireless performance. |
| 7 | 62.5% – 64.9% | The industry average for modern magnetic power banks. |
| 6 | 60.0% – 62.4% | The industry average for modern magnetic power banks. |
| 5 | 55.0% – 59.9% | Noticeable heat generation, resulting in standard energy loss. |
| 4 | 52.5% – 54.9% | Almost half the battery capacity is lost to the air as heat. |
| 3 | 50.0% – 52.4% | Almost half the battery capacity is lost to the air as heat. |
| 2 | 45.0% – 49.9% | Misaligned coils or terrible efficiency. Phone will get dangerously hot. |
| 1 | 40.0% – 44.9% | Misaligned coils or terrible efficiency. Phone will get dangerously hot. |
| 0 | < 40.0% | Coil failure or heat causes the unit to continuously pause charging. |
Validates if the solar panel is a functional survival tool or a useless marketing gimmick.
| Score | Criteria | Implication |
|---|---|---|
| 10 | > 3.00 Wh | Multi-panel, fold-out arrays. Can actually charge a phone if left out all day. |
| 9 | 2.50 – 2.90 Wh | High-quality monocrystalline single panel. Good for emergency top-ups. |
| 8 | 2.00 – 2.49 Wh | High-quality monocrystalline single panel. Good for emergency top-ups. |
| 7 | 1.75 – 1.99 Wh | Standard performance for a good quality rugged bank. |
| 6 | 1.50 – 1.74 Wh | Standard performance for a good quality rugged bank. |
| 5 | 1.00 – 1.49 Wh | Generates a trickle charge. Will keep the bank alive, but won’t fill it quickly. |
| 4 | 0.75 – 0.99 Wh | Barely overcomes the battery’s natural self-discharge rate. |
| 3 | 0.50 – 0.74 Wh | Barely overcomes the battery’s natural self-discharge rate. |
| 2 | 0.25 – 0.40 Wh | The panel works, but would take weeks to charge the battery. |
| 1 | 0.10 – 0.24 Wh | The panel works, but would take weeks to charge the battery. |
| 0 | 0 Wh | The panel is a dummy prop or solely triggers a green “charging” LED without passing current to the cells. |
Power Performance
The balance between thermal safety, speed, and clean electricity.
Wireless banks generate massive heat, so Max Temperature under load is their strictest hurdle. Laptop banks are severely punished if their Sustained Max Output throttles. Super Capacity “bricks” are defined heavily by how fast they Recharge.
For more information on how power performance is weighted, see Category Weighted Matrix.
Manufacturers heavily market “100W” or “140W” peak outputs, but many devices throttle to 65W or 45W within minutes due to overheating or cheap cells sagging under load. This metric evaluates what percentage of the battery’s total discharge cycle can actually sustain the advertised peak power.
| Score | Criteria | Implication |
|---|---|---|
| 10 | > 95% | Delivers peak power until the battery is completely dead. Perfect thermal management. |
| 9 | 85% – 94% | Only throttles at the very end of the cycle (normal low-voltage cell protection). |
| 8 | 75% – 84% | Sustains power for the vast majority of the cycle. |
| 7 | 65% – 74% | Minor thermal throttling, but holds peak speed long enough to fast-charge a laptop. |
| 6 | 55% – 64% | Throttles slightly past the halfway mark. |
| 5 | 45% – 54% | Holds peak power for about half its capacity before stepping down. |
| 4 | 30% – 44% | Struggles to hold peak wattage; heavily reliant on throttling to survive. |
| 3 | 15% – 29% | “Burst only.” Peak speed lasts less than 15-20 minutes before dropping heavily. |
| 2 | 8% – 14% | The advertised max wattage is a marketing gimmick lasting only a few minutes. |
| 1 | 1% – 7% | The advertised max wattage is a marketing gimmick lasting only a few minutes. |
| 0 | Instant Fail | Scam/Hazard: Triggers Over-Current Protection (OCP) and shuts off immediately at rated load. |
The surface heat generated during maximum output. Excessive heat destroys lithium-ion cells over time and poses a physical burn risk to the user.
| Score | Criteria | Implication |
|---|---|---|
| 10 | < 35.0°C (95°F) | Cool to the touch. Exceptional heat sinks/graphene cooling. |
| 9 | 35.0°C – 39.9°C (95°F – 104°F) | Barely warm. |
| 8 | 40.0°C – 44.9°C (104°F – 113°F) | Noticeably warm, but highly comfortable to hold. |
| 7 | 45.0°C – 49.9°C (113°F – 122°F) | Hot, but well within normal operating parameters for high-wattage GaN tech. |
| 6 | 50.0°C – 52.4°C (122°F – 131°F) | Getting uncomfortable to hold tightly; acceptable for “Laptop Class” devices pushing 100W+ |
| 5 | 52.5°C – 54.9°C (122°F – 131°F) | Getting uncomfortable to hold tightly; acceptable for “Laptop Class” devices pushing 100W+ |
| 4 | 55.0°C – 57.4°C (131°F – 140°F) | Too hot to hold comfortably. Nearing the IEC safety limits for metal/plastic contact. |
| 3 | 57.5°C – 59.9°C (131°F – 140°F) | Too hot to hold comfortably. Nearing the IEC safety limits for metal/plastic contact. |
| 2 | 60.0°C – 62.4°C (140°F – 149°F) | Dangerously hot. Damages internal battery chemistry rapidly. |
| 1 | 62.5°C – 64.9°C (140°F – 149°F) | Dangerously hot. Damages internal battery chemistry rapidly. |
| 0 | > 65.0°C (149°F) | Safety Hazard: Immediate fail. Test is aborted to prevent casing melt or thermal runaway. |
Voltage fluctuations (noise) on the DC line under heavy load. High ripple degrades smartphone batteries over time, causes touchscreen phantom-touches, and can damage sensitive peripherals.
| Score | Criteria | Implication |
|---|---|---|
| 10 | < 20 mV | Laboratory-grade clean power. Flawless filtering capacitors. |
| 9 | 20 – 35 mV | Extremely smooth delivery. |
| 8 | 36 – 50 mV | The gold standard target for premium consumer brands. |
| 7 | 51 – 70 mV | Clean power; zero negative effects on connected devices. |
| 6 | 71 – 90 mV | Minor noise, completely harmless to modern devices. |
| 5 | 91 – 120 mV | Standard budget performance. ATX power supply limit is 120mV. |
| 4 | 121 – 150 mV | Poor capacitor quality. Touchscreens may occasionally stutter while charging. |
| 3 | 151 – 174 mV | “Dirty” power. Long-term use may shorten the lifespan of connected devices. |
| 2 | 175 – 200 mV | “Dirty” power. Long-term use may shorten the lifespan of connected devices. |
| 1 | 201 – 225 mV | Dangerous for sensitive electronics. Extremely cheap PCB components. |
| 0 | > 225 mV | Dangerous for sensitive electronics. Extremely cheap PCB components. |
The practical recharge time. Charging from 0% to 80% is the Constant Current (CC) “sprint” phase. The final 20% (Constant Voltage) always tapers and slows down to protect the battery, making the 0-80% metric the most useful indicator of how fast a user can “grab and go.”
| Score | Criteria | Implication |
|---|---|---|
| 10 | < 45 Minutes | Next-gen charging (e.g., 140W input on a 24k bank). Exceptional convenience. |
| 9 | 45 – 59 Minutes | Under an hour. Perfect for a quick airport layover. |
| 8 | 60 – 74 Minutes | Standard for premium, well-balanced PD power banks. |
| 7 | 75 – 89 Minutes | Solid, respectable charging speed. |
| 6 | 90 – 104 Minutes | Acceptable, but starting to feel like a wait. |
| 5 | 105 – 120 Minutes | 2 Hours to hit 80%. Typical for budget brands or older 65W input laptops banks. |
| 4 | 121 – 150 Minutes | Slow. Usually caused by a 30W input limit on a large battery. |
| 3 | 151 – 240 Minutes | Requires planning your day around charging the bank. |
| 2 | 4 to 5 Hours | Antiquated input technology (e.g., 18W on a 20,000mAh bank). |
| 1 | 5 to 6 Hours | Antiquated input technology (e.g., 18W on a 20,000mAh bank). |
| 0 | > 6 Hours | e-Waste. Micro-USB speeds (10W) on modern capacities. |
Hardware power is useless if the power bank cannot digitally communicate with the connected device to unlock it. This evaluates if the power bank supports open, universal fast-charging standards (USB-PD, PPS) versus being locked to outdated or proprietary standards.
| Score | Criteria | Implication |
|---|---|---|
| 10 | Green for PD 3.0/3.1 (at max rated wattage), PPS (up to 5A if bank is 45W or higher), QC 4+/5, and legacy 5V (Apple 2.4A/BC1.2). | Universal Compatibility: Flawlessly triggers max speed on MacBooks, iPhones, and unlocks “Super Fast Charging 2.0” on Samsung devices. |
| 9 | Green for PD 3.0, PPS (up to 3A), and QC 3.0. | Triggers 25W Samsung Fast Charging, but fails to unlock 45W SFC 2.0 because it lacks the 5A PPS profile. |
| 8 | Green for PD 3.0, PPS (any Amperage), but missing Quick Charge (QC) or legacy Apple 2.4A fallback. | Works perfectly for modern USB-C phones, but charges older micro-USB or USB-A devices at agonizingly slow base speeds. |
| 7 | Green for PD 3.0 and QC 3.0. Red for PPS. | Fast charges iPhones and MacBooks perfectly, but Samsung/Pixel phones will default to slower 15W/18W charging. |
| 6 | Green for PD 2.0 or 3.0 only. Red for everything else. | Complies with USB-IF rules, but lacks the flexibility to fast-charge Androids utilizing QC or PPS standards. |
| 5 | Green for QC 3.0 / AFC / FCP, but Red for USB-PD. | Uses older USB-A standards. Cannot fast charge modern iPhones (which require PD) or modern laptops. |
| 4 | Red for PD and QC. Green only for proprietary brand standards (e.g., Huawei SCP, Oppo VOOC). | Incredibly fast for one specific phone brand, but acts like a cheap 10W charger for everyone else. |
| 3 | Green for Apple 2.4A (12W) and BC 1.2 only. | No fast charging at all. Capable of charging an iPad reasonably, but very slow for modern phones. |
| 2 | Green for BC 1.2 (5V/1.5A) only. Fails all other handshakes. | Acts like an old PC USB port. Will take 3+ hours to charge a modern smartphone. |
| 0 | Fails Auto Enum completely, or output drops to 0V when negotiated. | The controller chip is defective or missing. Will likely refuse to charge modern devices entirely. |
Portability
The balance between pocketability and spatial efficiency.
If you buy a Slim or Wireless bank, Thickness is almost half the grade. For Super Capacity, thickness and raw weight are irrelevant (0-10%), but Volumetric Density matters hugely, we expect it to be big, but it shouldn’t have wasted empty space inside.
For more information on how portability is weighted, see Category Weighted Matrix.
The absolute depth of the device. This is the #1 metric for determining if a device is “pocketable” or if it will create an uncomfortable bulge.
| Score | Criteria | Implication |
|---|---|---|
| 10 | <10.0 mm | Wafer-thin. Slips into a wallet or tight jeans unnoticed. |
| 9 | 10.0 – 12.9 mm | Thinner than a modern smartphone with a case. |
| 8 | 13.0 – 15.9 mm | Standard “Slim” bank limit. Comfortable in any pocket. |
| 7 | 16.0 – 19.9 mm | Noticeable pocket bulge, but manageable for daily carry. |
| 6 | 20.0 – 23.9 mm | The “Standard Brick.” Best kept in a jacket or sling bag. |
| 5 | 24.0 – 27.9 mm | Uncomfortable in pockets; requires a backpack. |
| 4 | 28.0 – 34.9 mm | Very thick. Will stretch small bag compartments. |
| 3 | 35.0 – 39.9 mm | Highly awkward. Cannot fit in standard backpack organization sleeves. It creates a massive bulge in any bag. |
| 2 | 40.0 – 44.9 mm | The design completely ignores human carrying habits. It rolls around in bags and cannot be stacked with a phone or laptop. |
| 1 | >45.0 mm | Utterly impractical for everyday carry. |
| 0 | Deceptive Bulk | Purely a plastic shell meant to trick the user into thinking it has a massive battery. |
The absolute physical burden added to the user’s everyday carry.
| Score | Criteria | Implications |
|---|---|---|
| 10 | < 100 g | “Forget it’s there” weight. Usually emergency 5k mAh banks. |
| 9 | 100 – 149 g | Lighter than a standard iPhone. |
| 8 | 150 – 199 g | Standard smartphone weight. Comfortable to carry. |
| 7 | 200 – 249 g | The limit of “comfortable” pocket carry. |
| 6 | 250 – 299 g | Noticeable sag in pockets. |
| 5 | 300 – 399 g | Backpack carry only. |
| 4 | 400 – 499 g | Roughly one pound. Very noticeable weight addition. |
| 3 | 500 – 599 g | Noticeable shoulder fatigue in a light backpack. Strictly for stationary coffee-shop working or camping. |
| 2 | 600 – 749 g | Heavily restricts portability. Dropping this on your foot or phone will cause damage. |
| 1 | > 750 g | This crosses the line from “Power Bank” to “Generator.” It requires its own dedicated carrying handle or heavy-duty bag. |
| 0 | Fraudulent Weight | The device contains artificial weights (e.g., glued-in steel plates, sandbags, or concrete blocks). This is a common scam on cheap e-commerce platforms to fake the “feel” of high-density lithium cells. |
The total 3D space the device occupies in a bag. While thickness dictates pocketability, Volume dictates how much of your backpack compartment is consumed.
| Score | Criteria | Implication |
|---|---|---|
| 10 | < 75 cm3 | Lipstick or credit-card size. |
| 9 | 75 – 119 cm3 | Size of a deck of playing cards. |
| 8 | 120 – 159 cm3 | Standard smartphone volume. |
| 7 | 160 – 199 cm3 | Slightly chunky, but highly packable. |
| 6 | 200 – 249 cm3 | Standard 20k mAh rectangular brick. |
| 5 | 250 – 349 cm3 | Takes up a dedicated slot in a tech pouch. |
| 4 | 350 – 449 cm3 | Large footprint. |
| 3 | 450 – 549 cm3 | Takes up the space of a thick paperback book. |
| 2 | 550 – 699 cm3 | Requires a main bag compartment. Cannot be packed in accessory pouches. |
| 1 | > 700 cm3 | Ludicrously oversized for the capacity it offers |
| 0 | Hollow Shell | The physical volume is artificially inflated to trick consumers. The internal PCB and cells occupy less than 40% of the internal volume. |
How tightly packed is the usable energy? This penalizes “hollow” plastics, large air gaps for cooling, or unnecessarily bulky “rugged” designs.
| Score | Criteria | Implication |
|---|---|---|
| 10 | < 75 cm3 | Lipstick or credit-card size. |
| 9 | 75 – 119 | Size of a deck of playing cards. |
| 8 | 120 – 159 | Standard smartphone volume. |
| 7 | 160 – 199 | Slightly chunky, but highly packable. |
| 6 | 200 – 249 | Standard 20k mAh rectangular brick. |
| 5 | 250 – 349 | Takes up a dedicated slot in a tech pouch. |
| 4 | 350 – 449 | Large footprint. |
| 3 | 450 – 549 | Takes up the space of a thick paperback book. |
| 2 | 550 – 699 | Requires a main bag compartment. Cannot be packed in accessory pouches. |
| 1 | > 700 | Ludicrously oversized for the capacity it offers |
| 0 | Hollow Shell | The physical volume is artificially inflated to trick consumers. The internal PCB and cells occupy less than 40% of the internal volume. |
How the device interacts with the human hand, other devices, and surfaces. Raw math (weight/thickness) cannot tell you if a power bank has razor-sharp metal edges that will scratch your $1,000 smartphone when placed in the same bag.
| Score | Criteria | Implication |
|---|---|---|
| 10 | Flawless | Matte/soft-touch finish (no fingerprints). Perfectly chamfered/rounded edges. Symmetrical. Stacks flush against a phone. Anti-slip rubberized feet or texture. |
| 9 | Excellent | Great grip, comfortable in hand. Ports are logically placed on one end so it can sit in a cup holder or pocket while charging. |
| 8 | Very Good | Premium materials (e.g., anodized aluminum), but slightly slippery, or slightly unbalanced weight distribution. |
| 7 | Good | Standard rounded plastic rectangle. Perfectly functional, but attracts some fingerprints or minor scratches. |
| 6 | Average | Basic utilitarian design. Boxy, but the edges aren’t sharp enough to cause discomfort. |
| 5 | Passable | Purely functional. Glossy plastic finish that acts as a fingerprint magnet and scratches immediately upon unboxing. |
| 4 | Sub-Par | Poor port placement (e.g., cables plug into opposite ends, making it impossible to put in a pocket/bag while in use). |
| 3 | Annoying | Distinctly uncomfortable. Sharp, unchamfered plastic or metal seams that dig into the hand. Scratches other devices in your bag. |
| 2 | Frustrating | Cylindrical or deeply rounded designs with zero flat edges. The device constantly rolls off airplane tray tables or desks. |
| 1 | Hostile | Form factor actively fights the user. Ports are recessed too deeply for standard cables to fit securely. |
| 0 | Hazardous | Edges are sharp enough to cut skin or fray carrying bags. Exposed contacts or severe chassis flex/creaking that indicates imminent physical failure. |
Build & Durability
The balance between premium aesthetics, legal compliance, and survival.
Travel Ready power banks will fail if their certification labels (Wh limits) rub off, so it accounts for 60%. Solar power banks dedicate 80% of their build score strictly to surviving the elements (IP and Drops).
For more information on how durability is weighted, see Category Weighted Matrix.
The structural integrity and premium feel of the chassis. It identifies if the manufacturer used high-quality materials (V-0 PC/ABS, Anodized Aluminum) or cheap, brittle plastics.
| Score | Observable Criteria |
|---|---|
| 10 | Unibody aluminum, carbon fiber, or ultra-thick reinforced polycarbonate. Zero flex under extreme torsion. Invisible seams. |
| 9 | Premium thick PC+ABS plastic. Zero creaking. Hairline, perfectly even seams across the entire device. |
| 8 | High-quality mix of materials. Yields very minor flex under extreme pressure, but produces zero creaking noise. |
| 7 | Good quality plastic. No creak under a normal grip, but slight creaking occurs under heavy torsion. |
| 6 | Standard plastic. Minor creaking when gripped firmly. Small but consistent panel gaps. |
| 5 | Standard injection-molded plastic. Noticeable creak when gripped. Visible but secure seams. |
| 4 | Cheap plastic. The center panel flexes inward easily when pressed with thumbs. Uneven panel gaps. |
| 3 | Very thin plastic. Bows inward far enough to feel it touching internal components. Loud, cheap squeaking. |
| 2 | Poor assembly. Panel gaps are large enough to see the internal PCB/wires or insert a fingernail. |
| 1 | Arrives with loose outer panels or broken internal plastic clips rattling inside out of the box. |
| 0 | Dangerous housing. Barely holds together; exposes live components under zero physical stress. |
Verifies that the manufacturer passed third-party safety audits (proving the cells won’t explode during a short circuit).
| Score | Observable Criteria |
|---|---|
| 10 | Globally verified: Valid UL Listed (US) + CCC (China) + TÜV/GS + Real CE. |
| 9 | Tier 1 verified: Valid UL Listed OR Valid CCC, alongside a Real CE mark. |
| 8 | Secondary Tier: ETL or CSA mark + Real CE + FCC + RoHS. |
| 7 | Real CE (European Conformity – correctly spaced) + FCC + RoHS + UKCA + PSE. |
| 6 | Real CE + FCC + RoHS. (This is the standard acceptable global baseline). |
| 5 | Average. Regional marks only (e.g., just FCC or just PSE) with no major global safety audit mark. |
| 4 | Generic marks only (e.g., only RoHS or a generic recycling bin). Missing mandatory CE/FCC marks. |
| 3 | Fake marks visually detected (e.g., the deceptive “China Export” logo where the C and E are touching). |
| 2 | Markings are printed on a cheap, easily removable paper sticker rather than on the chassis itself. |
| 1 | Proven fraudulent certification (e.g., database check reveals a fake UL or CCC registration code). |
| 0 | Completely blank chassis. Zero regulatory or safety markings. Illegal to sell in most jurisdictions. |
Protection against elemental ingress. Critical for the “Solar/Outdoor” category; a nice bonus for others.
| Score | Observable Criteria |
|---|---|
| 10 | True IP67/IP68. Fully potted internals. Thick, double-ridged rubber port covers. Survives 30s submersion perfectly. |
| 9 | IP65/IP66. Heavy water-jet proof. Flush, tightly secured rubber flaps that require physical force to pry open. |
| 8 | IPX4/IP54. Splash-proof. Basic silicone covers that seat firmly over the ports. |
| 7 | Unrated, but highly weather-resistant. No flaps, but deeply recessed ports and conformal coating visible on the PCB. |
| 6 | Unrated. No flaps. Ports are flush. Chassis has no visible cooling vents or gaps. |
| 5 | Average. Unrated. Standard consumer design. Minor natural gaps around ports. (Baseline for indoor power banks). |
| 4 | Unrated with vulnerabilities. Loose buttons or slightly oversized port cutouts that invite dust/lint. |
| 3 | Claimed “Rugged/Waterproof” but flaps pop open easily on their own or don’t seal properly (Deceptive). |
| 2 | Noticeable ventilation grilles exposing the internal battery cells to open air/moisture. |
| 1 | Large open seams. A single drop of sweat or rain will pool directly onto the motherboard. |
| 0 | Claimed IP67+ but immediately fails the submersion/splash test (bubbles appear, or it shorts out). |
The device’s documented ability to survive falls, and the manufacturer’s physical design choices to mitigate kinetic impact (e.g., shock-absorbing materials, recessed screens).
| Score | Observable Criteria |
|---|---|
| 10 | Officially certified to MIL-STD-810G/H (or equivalent 3rd-party lab standard). Features 360-degree shock-absorbing armor or heavy TPU bumpers. |
| 9 | Manufacturer explicitly guarantees a specific drop height (e.g., “Certified 2-meter drop safe”) AND the device features thick, integrated rubberized corners. |
| 8 | No official certification, but the design includes substantial integrated shock-absorption (TPU bumpers, ribbed silicone grips) specifically engineered for impacts. |
| 7 | No drop claims, but the chassis is unibody metal or ultra-thick polycarbonate with heavily rounded corners that disperse kinetic energy well. |
| 6 | Standard hard plastic/metal chassis, but the manufacturer includes a fitted, protective silicone/rubber shock sleeve in the box. |
| 5 | Standard consumer electronic. No drop claims. Hard plastic or bare aluminum with no shock absorption. (Will likely dent/scuff if dropped, but expected to survive). |
| 4 | Heavy device (>300g) with sharp, unreinforced corners. The weight combined with sharp geometry means a desk-height drop will almost certainly crack the casing. |
| 3 | Incorporates fragile materials (e.g., glass display screens or glossy acrylic panels) that sit flush with or protrude above the chassis, with zero raised protective bezels. |
| 2 | Made of exceptionally thin, rigid plastic that flexes under normal finger pressure. Guaranteed to shatter upon impact. |
| 1 | Marketed heavily as “Rugged,” “Tough,” or “Shockproof” on the box, but physical inspection reveals zero shock-absorbing materials (just styled hard plastic). |
| 0 | Arrives from the factory with broken internal plastic clips, rattling internal components, or a cracked housing simply from standard shipping and handling. |
Additional Scoring Rules
- The “Glass Tax” (Scores 3-4):
Many modern “Pro” power banks (like the Shargeek 170 or Anker Prime series) feature beautiful glass screens to show charging stats. While this looks premium, glass is the enemy of impact resistance. If that screen is not recessed behind a protective plastic lip, it caps the score at a 3 or 4, regardless of how nice the rest of the aluminum body feels. - Handling “Average” Devices:
90% of the power banks you test in the Laptop, Slim, and Wireless categories will score a 5 here. That is perfectly fine. They aren’t designed to be dropped off a mountain. The Category Weighted Matrix will ensure this “5” doesn’t drag down their overall score, while allowing a rugged MIL-STD solar bank to score a 10 and get a massive boost in the Outdoor category.
Quality-of-Life (QoL) Features
The “Bonus” points for engineering thoughtfulness. Quality-of-Life features are often the most felt part of using a power bank and also the most poorly scored in reviews. Too often, products get punished for missing features they were never designed to have, or rewarded for gimmicks that don’t actually improve daily use. This scoring system was built to avoid that.
QoL features are not about raw performance or specs. They are about reducing friction during everyday use. That includes having fewer cables to carry, less port juggling, information clarity at a glance, quiet operation for the confidence that things are charging correctly.
If a feature doesn’t reduce friction, it shouldn’t inflate the score.
A Laptop-class power bank should prioritize pass-through charging and clear power information. A Wireless power bank lives or dies by magnetic strength and silent operation. A Slim & Lightweight power bank benefits most from an attached cable and simple usability. A Rugged/Solar power bank is judged more on utility features like lighting and clarity in poor conditions.
For more information on how features are weighted, see Category Weighted Matrix.
All power banks are evaluated against the same set of QoL features with a published 0-10 scoring scale:
Evaluates whether an integrated cable reduces the need to carry accessories.
Why? A bad built-in cable is worse than none — this captures that.
| Score | Criteria |
|---|---|
| 10 | Integrated USB-C cable, supports full rated output, retractable or neatly recessed |
| 9 | Integrated cable, full power, securely stowed |
| 8 | Integrated cable, slight power limit (e.g. 20W vs 30W) |
| 7 | Integrated cable, short or stiff but usable |
| 6 | Integrated cable, awkward routing or storage |
| 5 | Detachable cable included, matches full output |
| 4 | Detachable cable included, lower power |
| 3 | Short/basic cable included, impractical |
| 2 | Cable included but proprietary |
| 1 | No cable |
| 0 | Requires proprietary cable not included |
Counts how many devices can be charged at the same time, regardless of connector type, focusing on simultaneous usefulness, not raw port count.
Note: Wireless counts as a channel only if usable while wired output is active.
| Score | Criteria |
|---|---|
| 10 | 4+ usable channels with smart power sharing |
| 9 | 3 channels, minimal throttling |
| 8 | 3 channels, some throttling |
| 7 | 2 channels, stable |
| 6 | 2 channels, noticeable throttling |
| 5 | 1 channel + wireless |
| 4 | Single high-power channel only |
| 3 | Single low-power channel |
| 2 | One input/output shared port |
| 1 | One-direction-only |
| 0 | Charging requires adapter or dock |
Measured using a physical shake test with a MagSafe-compatible phone.
Test: Shake test with a phone attached
(hold power bank + phone, shake vertically 3–5 times)
| Score | Criteria |
|---|---|
| 10 | No movement, survives aggressive shake |
| 9 | Minimal movement |
| 8 | Holds under normal shake |
| 7 | Slight shift, no detachment |
| 6 | Shifts easily but stays attached |
| 5 | Requires careful handling |
| 4 | Detaches with moderate shake |
| 3 | Detaches with light shake |
| 2 | Slides off easily |
| 1 | Barely magnetic |
| 0 | Magnet advertised but non-functional |
Evaluates usefulness, not brightness claims.
Test focus: Usefulness, not gimmick LEDs
| Score | Criteria |
|---|---|
| 10 | Bright multi-mode flashlight, long runtime |
| 9 | Bright single-mode, wide beam |
| 8 | Bright but narrow beam |
| 7 | Usable emergency light |
| 6 | Adequate but weak |
| 5 | Dim but functional |
| 4 | Decorative LED |
| 3 | Very dim |
| 2 | Blink-only |
| 1 | Barely visible |
| 0 | Advertised but unusable |
Assesses how clearly the power bank communicates charging status, focusing on information clarity.
| Score | Criteria |
|---|---|
| 10 | % + W in/out + time estimate |
| 9 | % + real-time wattage |
| 8 | % + charging state |
| 7 | % only |
| 6 | Bar + numeric |
| 5 | Bar indicator |
| 4 | Multi-LED, vague |
| 3 | Single LED |
| 2 | Color-only indicator |
| 1 | Ambiguous indicator |
| 0 | No indicator |
Tested by charging the power bank while it charges a device.
Test: Wall → Powerbank → Device Simultaneously
| Score | Criteria |
|---|---|
| 10 | Full-speed pass-through, no throttling |
| 9 | Minor throttling |
| 8 | Works reliably, slower |
| 7 | Works but unstable |
| 6 | Works only with low load |
| 5 | Works but pauses device charging |
| 4 | Requires specific order |
| 3 | Unreliable |
| 2 | Advertised but barely works |
| 1 | Manual switching needed |
| 0 | Not supported |
Evaluates how easily ports can be identified and used without trial and error.
| Score | Criteria |
|---|---|
| 10 | Clear icons + orientation + tactile cues |
| 9 | Clear icons + orientation |
| 8 | Clear printed labels |
| 7 | Labels visible in good light |
| 6 | Small or poorly placed labels |
| 5 | Partial or ambiguous |
| 4 | Ports unlabeled |
| 3 | Guess-and-check required |
| 2 | Confusing layout |
| 1 | Misleading labels |
| 0 | Incorrect labelling |
Assessed in a quiet room during peak rated discharging.
| Score | Criteria |
|---|---|
| 10 | Completely silent |
| 9 | Nearly silent |
| 8 | Faint noise, only close |
| 7 | Audible only in silence |
| 6 | Audible but ignorable |
| 5 | Noticeable hum |
| 4 | Mild coil whine |
| 3 | Clearly annoying |
| 2 | Distracting |
| 1 | Very loud |
| 0 | High-pitched / intolerable |
Value
For the value pillar, we use a a universal formula of a device’s MSRP in US Dollars divided by the peak measured discharge capacity in Wh. We use MSRP, not “sale price,” to ensure fairness and consistency over time, as Amazon prices fluctuate daily.
The goal is to calculate the Dollar Cost per Usable Watt-Hour ($/Wh). Lower is better.
| Score | Criteria | Implication |
|---|---|---|
| 10 | < $0.60 / Wh | Phenomenal capacity for the price. |
| 9 | $0.61 – $0.75 / Wh | Highly competitive pricing. |
| 8 | $0.76 – $0.90 / Wh | Highly competitive pricing. |
| 7 | $0.91 – $1.10 / Wh | Standard pricing for quality brands |
| 6 | $1.11 – $1.30 / Wh | Standard pricing for quality brands |
| 5 | $1.31 – $1.50 / Wh | You are paying a “tax” for screens, 140W speeds, or ultra-compact designs. |
| 4 | $1.51 – $1.70 / Wh | You are paying a “tax” for screens, 140W speeds, or ultra-compact designs. |
| 3 | $1.71 – $2.10 / Wh | Luxury branding or heavily overpriced for the capacity. |
| 2 | $2.11 – $2.50 / Wh | Luxury branding or heavily overpriced for the capacity. |
| 1 | $2.51 – $3.50 / Wh | Ludicrously oversized for the capacity it offers |
| 0 | > $3.51 / Wh | Absolute rip-off. |