Dakota Lithium has optimized this charger for use with our lithium iron phosphate batteries (LiFePO4). All 12 volt Dakota Lithium batteries should be charged using a LiFePO4 compatible charger like this one. SLA chargers will reduce the performance and lifespan of the battery. This charger charges at a speed of 3 amps an hour and is optimal for batteries < 25Ah. For batteries greater than 25Ah like the 54Ah or 100Ah battery we recommend the 10 amp charger.