The boost charge should be applied until the charging current falls below 0.5 percent of theīattery’s 20 hour rated capacity (0.5 amps for a 100 Ah battery).'Īnd I'll add, I'm not a believer in leaving any battery on 'float' for more than a couple days, there's nothing to be gained aside from a damaged battery (IMO). Voltage charger set at 14.4 to 15.0 volts for a 12 volt battery (7.2 to 7.5 volts for a 6 volt battery). This OCVĬorresponds to approximately 75% state of charge.
Voltage (OCV) drops to 12.5 volts for a 12 volt battery (6.25 volts for a 6 volt battery). 'While in storage, batteries should be boost charged every 90 days or when the open circuit The quickest way to shorten the life of a battery is to overcharge it, the 2nd fastest way is to allow it to discharge beyond 50~75%, 3rd mistake is to never charge it to full capacity. I think if your charger reaches 14.4V at some point then you can be confident the battery is fully charged and should stop there or soon after, especially as voltage approaches or exceeds 14.8V You need to see 14.4 I think. An AGM battery requires a little higher voltage to maximize sulfation reversal than an ordinary flooded cell.
