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What test should have undergone while testing power banks?
Efficiency more efficient power bank is, a lower operating temperature it will have, which wastes less energy for a longer life expectancy.
Over Current Protection it prevents too much power going into the battery pack and the power going out to the connected equipment, protecting the delicate circuitry of both devices.
Over Voltage Protection it protects both the power bank and the connected device by keeping the voltage within recommended safety parameters to avoid damage.
Over Discharge/Charge Protection some power banks consistently monitor charge states to prevent this from happening.
Heat Tests at Extreme Temperatures While using batteries in extreme temperatures isn’t advised anywhere.