Overview and Specifications:
Input voltage: 1.5-3V
Output voltage: 5V
Output current: 500MAH-1500MAH
Output USB: MICRO USB
Use two batteries, the most common No. 5 / AA battery, or No. 5 rechargeable NiMH battery
Built-in DC-DC boost circuit, boosting 5V with two batteries, conversion efficiency of 98%, loading a new AA battery No. 5
You can charge your smartphone for 30 minutes to charge 40% (output 500MA-800MA).
When the dry battery is low, the dry battery will be hot. If the battery is replaced with nickel-metal hydride No. 5, there will be no heat.