The ELECTCOS LLC AA 1.5v batteries cells used in our batteries are capacitive. Its benefits are: FAST CHARGE TIME: With our advanced lithium rechargeable technology same quality / Technologies as Laptop and Mobile phones batteries used, Electcos LLC lithium aa batteries can charge up to 1.5 Hours, it’s 10x faster than conventional rechargeable batteries. ANTI-LEAKING TECHNOLOGY: Leakage destroys the device? Then choose Electcos LLC Lithium Rechargeable AA battery, it for safety and peace of mind! Double-layer steel shell protection, explosion-proof and leak-proof OVER 1000 CHARGING CYCLES: Cycle life 1000 , equivalent to 1000 ordinary batteries, environmentally friendly and alternative to polymer batteries, one rechargeable battery can reduce 1,000 units of pollution It not only saves money, but also every degree of energy that recharges the earth CONVENIENT USB-C CHARGE PORT: Use the included cable to charge four batteries at once. The built-in LED charging indicator shows when batteries are fully charged, no need to buy extra chargers. SAFETY & WARRANTY: It has a charge and discharge protection chip to protect the circuit from short circuit and causing charging explosion, we take responsibility of quality of our products with a limited lifetime warranty, covering manufacturing defects and failures during normal use.   USE WITH DEVICES: Gaming controllers / Clock / Remote control / Toys / Mouse / Keyboard / wireless Mice and many more 1.5V devices of AA size are fully compatible! Rechargeable lithium batteries, a lifelong partner for home appliance experts