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Chargers for 12V Lithium batteries : LFP (LiFePO4) technology allows a fast charging of the battery, sometimes in only 2 hours. This technology having a very low discharge (<5% per month), the floating function is not useful.
Charge current is automatically regulated thanks to its algorithm for more efficient charging and longer battery life.
The charge voltage of a 12V LFP battery is 14.6V +- 0.1V
In order to get charging time of an LFP battery according to the associated charger, simply divide the capacity of the battery (Ah) by the available charging current (A) of the charger. For example, for a 100Ah battery with a 40A charger: 100 devided by 40=2.5 that is to say 2h30.