Ultra-Long Lifespan Up to 1500 CyclesThis D-type lithium battery supports up to 1500 charge/discharge cycles, far exceeding traditional alkaline batteries. Durable and eco-friendly, it reduces replacement costs over time. High Capacity 12000mWh of Lasting PowerWith a 12000mWh capacity, each battery delivers a steady 1.5V output, ideal for high-drain devices like radios, toys, and flashlights. Smart LED Indicator Easy Charging StatusBuilt-in LED light flashes green while charging and turns solid green when fully chargedno guesswork, no overcharging. USB-C Direct Charging Universal ConvenienceNo charger neededjust plug the battery into any USB-C port (laptop, power bank, adapter) for fast, hassle-free charging. Safe & Eco-Friendly Advanced ProtectionFeatures built-in smart chip with safeguards against overcharging, over-discharging, and short circuits. Memory-free and reusable for a greener planet.