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 ?
How long since it was last charged/floated? If it has been sitting idle for several months, chances are that when combined with ~50ft of rope, it will make a great accessory for your boat. Idle flooded-cell batteries loose about 10% of their charge per month, especially in the summer. Sealed-Lead-Acid (SLA) batteries loose about 3-5% per month.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,
14.5V charge voltage is already in the deep red zone.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.