High drain rechargeable 18650 cells, maximum current up to 20A, very strong. Stable discharge rate, no ''memory effect'', 100% real capacity 3400mAh. Low re-occurring operation cist, short-circuit and over-current protection. Safe and environmental friendly, extreme long charging circles, great for long term daily use. High energy density, and have an extra long life for all your battery powered devices.Provides excellent continuous power source solutions to your devices..syi