Keep all of your 12-Volt lead acid batteries charged and running with this 750mA Battery Charger/Maintainer. The BikeMaster Charger/Maintainer 750mA is perfect for keeping all of your 12-Volt lead acid batteries in top condition, including conventional acid batteries (wet), factory-activated maintenance-free batteries (FA), absorbed glass mat maintenance-free batteries (AGM) and gel batteries (gel electrolyte). The charger is fully automatic with reverse polarity, overcharge and short circuit protection. It will bulk charge at a constant 750mA rated current output until the battery is fully charged (13.6-Volts /-0.2-Volts) and then the charger automatically switches to maintenance mode. When in maintenance mode, the battery is constantly monitored. If the battery voltage falls below 12.8-Volts /-0.2-Volts, the bulk charge mode will restart to charge the battery at a constant 750mA until fully charged, then the charger automatically switches back to maintenance mode, which repeats indefinitely allowing the charger to stay connected worry-free.