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Lithium LiFePO4 battery 12.8V 50Ah - Smart
LiFePO4 batteries are the safest lithium ion batteries on the market. The nominal voltage of a LiFePO4 cell is 3.2V, unlike 2V for acid batteries, so a 12.8V battery contains 4 cells connected in series, and a 25.6V battery contains 8 cells connected in series.