The regular Li-Ion charge to 4.2V per cell so it is 12.6V max for 3 and 16.8V for 4. I use 12.6V but get full power only for the first 30% of charge. May be a bit better if a series diode in KX3 is removed that adds about 0.6V drop. One can charge the 4 cell Li-Ion battery to 15V only, for less charge. There may still be weight gains compared to LiFePO3. Ignacy
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