Ni-MH battery is a combination of hydrogen ion and metal nickel, and its power reserve is 30% more than that of nickel-cadmium batteries. It is lighter than nickel-cadmium batteries and has a longer service life. It has no pollution to the environment and no memory effect. The disadvantage of nickel-metal hydride batteries is that the price of nickel-cadmium batteries is much more expensive, and the performance is worse than that of lithium batteries.
Lithium Ion Battery