Leica Geosystem batteries are currently available using nickel-cadmium (NiCd), nickel-metal hydride (NiMH) and Lithium Ion (Li-Ion) cells.
The NiCd cell is a proven, mature type of cell requiring little maintenance. Suitable for high charging and discharging currents and problem-free usage down to –20 °C (–4 °F).
NiMH cells have a higher internal resistance than NiCd cells and are therefore not suitable for such high charging and discharging currents or low temperatures as NiCd cells.
Li-Ion cells have a high energy density. This minimises battery size and weight. It is a low maintenance battery; there is no memory effect and no scheduled cycling is required to prolong the battery’s life.