I have be use my rechargable mag light with the ni-cad battery pack for over five year . it charge when I be not use the light and when I pick it up to use the light these battery really hold a charge . I take it on trip without even bring the charger . it be one of my favorite tool . the battery do not leak and it be ZERO trouble . I recommend this light and battery pack for everyone . portable , rugged , dependable and very useful .