What voltage do i need to apply to a lead acid battery to fully charge it ? will it still fully charge at 13.5 volts albeit more slowly ?
I'll get it down and put it on charge...
+1I keep all my little-used batteries on continuous float-charge: 12.9 to 13.2V for flooded-cell,
If you want to charge it quickly charge at a high constant current (>50A or so) and stop charging when the voltage reaches 14.5V.