What is the characteristic of a portable battery?
Every battery constitutes an energy converter. It is capable of converting stored chemical energy into electricity energy directly. In the case of rechargeable batteries, this process is described as the following: when charging electricity energy is converted into chemical energy ->during discharge the conversion is reversed->during charge electricity energy is converted into chemical energy, on secondary batteries this process can repeat more than 1000 times. Rechargeable portable batteries are available in different electrochemistry battery systems, i.e. lead acid systems (2V), Ni-Cd systems (1.2V), Ni-MH systems (1.2V), and Li-ion systems (3.6V). The typical characteristics for the above battery systems are their relatively constant discharge voltages (when discharge a voltage flat roof is available), as well as the quickly breaking down voltages both at the beginning and the end.
