HW Rechargeable aa batteries, 3500mWh long lasting power, 1000+ cycles, 2.5h fast charge. Ideal for high power consuming devices such as Xbox controller, motorized toys, remote controls, smart home devices, microphone, medical devices. Stable Output: These AA lithium batteries have a 1.5V constant output, delivering stronger power and better performance than 1.2v Ni-MH batteries. Ideal for high power consumption devices such as toys, game controllers, cameras, and more. Independent Charging - HW universal battery charger, you can charge any combination of AA / AAA lithium ion batteries without having to charge the battery in pairs. Safety Protection: HW double a rechargeable battery has multiple protection. It is equipped with an intelligent protection IC that prevents overcurrent, overvoltage, overcharge, overheating and short circuit. 1000 + Long Cycle Life: HW rechargeable aa batteries have a relatively low self-discharge rate. With up to 1000+ recharge cycles, they offer advantages in energy conservation and environmental friendliness. HW Rechargeable aa batteries, 3500mWh long lasting power, 1000+ cycles, 2.5h fast charge, double a lithium ion battery