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The Graupner battery guard 2 can be used to check the remaining capacity of LiPo, LiFe, NiMH and NiCd batteries. Version 2 of the battery guard is supplied using its own power, therefore it does not require an additional power supply. For Lithium batteries, voltage and the remaining capacity of each cell are displayed. The voltage of the highest/lowest cell plus the voltage difference between the highest and the lowest cell are also displayed.