BFL13 wrote:
As the battery voltage rises from being charged, amps will start to taper from the lowest voltage charger of the three until amps get to zero when the voltages are the same, then amps will be tapering on the next highest voltage charger until battery voltage rises to its voltage, and now only the highest voltage charger is supplying amps (to its current limit).
Keep in mind that with LiFePo4 batteries the charging curve is mostly flat. So your battery will stay at 3.3v for a very long time until it hits the knees and then it will shoot up. This is why a BMS is critical. Also LFP batteries in general will take a 1C charge, though some take 3C.
So it's not really a taper. It's more like a firehose and then suddenly(from a voltage perspective) your battery is full.
