Do you want the economical and greener lifestyles? Maybe you should start from using the UltraFire 14500 rechargeable batteries. The 14500 rechargeable batteries adopt universal standards most of them suitable for cameras toys and many other electronic devices. Except that it features extensively long working life and high efficiency great for use. The battery is compact and rechargeable so you can carry it anywhere anytime convenient to use. Voltage: 3.6V (fully charged 3.9V) Capacity (manufacturer claimed): 900mAh - Ideal upgraded power source for the compact LED flashlights - Can be charged by the AC charger - Ultra-high capacity and premium built quality