I am building up a new bank of 6v golf cart batteries (US Battery
2200xc) with 8 batteries comprised of 2 24v strings in parallel.
I am initially charging
all of the batteries in parallel with a small bench supply and watching the specific gravity of the cells. They were wildly different to start with but are all now between 1.265 and 1.270.
The question I have is with regard to ending the charge and making up the series / parallel strings.
Should I stop the charge and immediately pull the paralleled batteries apart or let them set for 24 - 48 hours in parallel prior to pulling them apart and making up the 24V bank.
Unfortunately the supply I have available for 6v charging
is only capable of 5A so I have been charging 4 batteries in parallel and then moving on to the other 4.
Some specific gravities started as low at 1.230 but all are now up in between 1.265 and 1.270 (probably identical within measurement error at this point).
I tried pulling a bank of 4 apart after charging to an equalization
voltage, the result was 3 of the four batteries are within 0.01v of each other when charging and identical with discharging. The fourth battery
is about 0.07v higher than the other three. Specific gravity of all of the cells is very close to each other although one cell in the high battery is 0.005 higher specific gravity than the rest (1.275 rather than 1.270).
Thus the question of if parallel charging flooded lead acid batteries prior to making up a series / parallel set should they be left connected and allowed to sit for 24 to 48 hours or immediately put into the series configuration after charging?