DEVICE WITH ELECTRIC LOAD

The invention relates to a device (1) with an electric load (40) and a replaceable electric energy store (30). The energy store (30) has at least one first storage unit (31) with a first initial energy quantity E1 and at least one second storage unit (32) with a second initial energy quantity E2, wherein an electronic measuring/operating circuit (20) is designed to actuate the first storage unit (31) or the second storage unit (32) according to an algorithm. By actuating the first storage unit or the second source unit, the energy supply of the device is ensured by the respective storage unit,and by actuating the first storage unit or the second storage unit, it is ensured that when the remaining energy quantity or the applied energy quantity of one storage unit is low, the respective other storage unit has a remaining energy quantity of at least 10%, in particular at least 20%, preferably at least 30%, of the total energy quantity EG of the first initial energy quantity E1 of the first storage unit (31) and