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DURABLE & LONG LASTING This lithium ion AAA battery can be charged over a 1000 cycle lifespan, which means the value of 4 pieces of our USB batteries is far more than 4000 pieces of other non-rechargeable types. Save as much money as you can calculate. Convenient and fast charging via USB: To charge, simply connect the batteries with the included 4-in-1 USB charging cable and plug it into any USB port with power supply, e.g. PC, mobile phone charger adapter, power bank, car charger, etc. Full charge in approx. 1 hour. No additional charger required! Built-in indicator light: the indicator light indicates charging, the red light indicates charging. It showed green light when fully charged. Wide Applications Like normal AAA batteries, ideal for low power devices and some high power consumption devices. Ideal for remote controls, toys, game controllers, headlights, wireless mouse, flashlight, calculator, household products and so on. More Safety: Built-in safety circuit protects the battery from deep discharge/overcharging; The lithium cell is UL listed. Our USB batteries are RoHS, FCC, UN38.3, MSDS and CE listed. Leak-proof battery.