Whether a battery is rechargeable depends on its electrochemical property.

A primary battery, also known as single-use battery, discharges only once, so its internal structure is much simple, for example, 23A cell-type battery.

If it is necessary to use a battery repeatedly, the internal structure of the battery must be redesigned to accommodate the needs of rechargeability.

Rechargeable batteries currently available include Ni-CD, Ni-MH, Li-ion, and Li-polymer.