BFL13 wrote:
So just because you start off at 4 x the charging rate, does not mean you will get to full in 1/4 the time. Need more info and then we could see what really happens for how much faster the LFP is.
You are correct, you will get LiFePO4 to full in much less than 1/4 of the time than lead acid. You are focusing on one relatively insignificant point (whether the LiFePO4 goes to absorb at 95 or 98% SOC) and ignoring the elephant in the room, that once lead acid goes to absorb it will be there for 4 - 6 hours before it is full.
The other point that is being ignored is that unlike lead acid, there is no need to get LiFePO4 batteries to 100% full. I can't think of an application where you would care (or could tell) if you only got the battery to 95 - 98% full, in which case you are done in under 1 hour.
But if you insist on chasing down the minutiae, there is almost no difference in the charge curve for 0.5C/1.0C for LiFePO4:
