NiMh batteries are rechargeable batteries that have replaced nickel cadmium batteries. In fact, nickel cadmium batteries, in addition to being generally less performing, are not allowed in the European Community.
NiMh batteries are better able to withstand certain stresses, such as total discharge or higher current requirements. For this reason, they adapt to a variety of conditions of use and are available in AA (stylus) or AAA (ministyle) format.
While lithium batteries, although having the prerogative of being lighter, are subject to several problems and the device that uses it, must provide a series of measures to adjust the current loads to be required from the battery.