2/3A 700mAh NiCD Rechargeable Battery is excellent for building custom battery packs. These batteries can be recharged 500-1000 times giving you years of use. These high-quality rechargeable Nickel Cadmium (Ni-Cd) batteries are exact replacements for standard battery in all the device. It is a good practice to do deep-discharge or complete discharge at least once 4 to 8 weeks. Deep discharge ( complete discharge ) is important for Ni-Cad not to develop memory effects. Compared with other types of rechargeable cells, Ni-Cad batteries offer good cycle life and performance at low temperatures with a fair capacity but its significant advantage is the ability to deliver practically its full rated capacity at high discharge rates (discharging in one hour or less).