How to Choose a Power Bank

Step by step

1. 1 min

   Calculate your total capacity requirement

   Identify the battery capacity (mAh) of your primary devices. Multiply the total capacity by 1.5 to account for energy conversion loss and heat, then select a power bank with at least that rated capacity.

   Note: Conversion loss is unavoidable; a 10,000mAh bank typically provides approximately 6,500mAh to 7,000mAh of actual output.
2. 30 sec

   Check output wattage requirements

   Confirm the power delivery (PD) requirements for your devices. Smartphones require 18W-20W, while laptops and tablets necessitate 45W-100W for sustained charging speeds.

   Note: Using a bank with lower wattage than required will result in extremely slow charging or failure to charge while the device is in use.
3. 30 sec

   Select port configurations

   Prioritize banks with USB-C Power Delivery ports for universal compatibility. Ensure the bank features enough ports to charge your hardware simultaneously without significant power throttling.

   Note: Avoid older power banks that rely exclusively on USB-A if you use modern fast-charging standards.
4. 30 sec

   Confirm safety certification

   Only purchase banks that list UL, CE, or FCC certification. Look for explicit mentions of over-voltage, short-circuit, and temperature protection circuitry.

   Note: Never purchase off-brand power banks that lack transparent safety testing documentation.
5. 1 min

   Evaluate weight versus capacity

   Determine the portability trade-off based on your travel habits. A 10,000mAh battery is sufficient for daily commuting, while 20,000mAh or higher is necessary for extended travel despite the significant increase in weight.

   Note: Air travel regulations limit most commercial flights to power banks under 100Wh capacity.