Very reliable chargers. I use two 36 volt chargers a day as well as one of the 24 volt chargers. All fully charge the batteries, and fast. The 36 volt settings are 39.6 volts when they have stabilized the next morning after charging. I use a 12Ah kit and another 22Ah 36V kit and the chargers handle both sizes with no problem. I am using a 24 volt charger for a 35ah battery and it works great.