It is a sealed lead acid, however it has a very high Ah rating (around 90 Ah if I recall correctly), I could potentially charge it at up to 20 Ah, the charger will be any standard 4 stage battery charger that will work. Also if anyone knows a way to calculate how quickly different chargers will charge at battery based on amp hours of the charger that would be awesome, so I can select what charger I want to use. I'm undecided currently until I compare price vs time for different chargers.