Uniross USB-C Rechargeable AA Battery (Pack of 4) are high-quality lithium-ion batteries that deliver a stable 1.5V output for 95% of their runtime, ensuring consistent device performance. Equipped with integrated electronics, they are protected against overcharging, overloading, short circuits, and deep discharges. The wide temperature range (-20°C to +60°C) makes them perfect for various devices, from wireless keyboards to electric toys. With a 2400 mWh capacity and fast 2-hour charge time via USB-C, enjoy extended usage and up to 1000+ recharge cycles.