Motorola batteries for two-way radios are especially designed, built & tested to take the tremendous abuse radios have to handle in the field. Hard knocks & extreme temperatures can cause batteries to lose power. & a sharp drop in power or rise in impedance can easily cause the radio receiver to completely shut down, or "desense." Motorola Lithium Ion (Li-ion) batteries have a higher energy-to-weight ratio than Ni MH batteries, offering a lighter, smaller power supply for more compact devices. They also offer a major advantage of not experiencing "memory effect."