Core parameter analysis of power banks: capacity, power, and safety

Power banks are the 'energy supply stations' for mobile devices, but their parameter complexity often confuses consumers. Understanding core indicators can avoid purchasing misconceptions.

Capacity and actual output:

The nominal capacity (mAh) ≠ actual output. For example, a 20000mAh battery can only provide about 74Wh of power at 5V/2A output, while mobile phone batteries typically have 30-50Wh, and the actual available capacity is affected by conversion efficiency (about 60-70%).

Power determines speed: A power bank that supports 20W PD protocol can achieve 27W fast charging for iPhone 14 Pro Max, while a power bank that only supports 5W requires more than 1 hour to fully charge.

Security technology:

Temperature control: High quality power banks are equipped with NTC thermistors to monitor temperature in real-time and prevent overheating from causing combustion.

Fireproof material: Made of UL94 V-0 certified flame-retardant PC shell, capable of withstanding more than 10 seconds of open flame burning.

Scene adaptation:

Travel purpose: Select products that support multiple protocols (PD/QC/FCP) and have passed civil aviation certification (within 100Wh);

Outdoor emergency: prioritize high-capacity (20000mAh+) and solar charging function.