What is float charging? What float voltage is recommended?

This type of charge continually monitors and maintains a pre-set battery voltage, regardless of charge conditions. These chargers are used in stationary, emergency back-up power, emergency lighting, and other applications. Most high quality AGM and Gel chargers will have an alternative float cycle in its finishing charge algorithm. The frequency of discharge and temperature will dictate a more exact setting. For example, the more frequent the discharge, the higher the suggested recharge voltage should be to ensure that the recharge time is sufficient to maintain the batteries proper performance. The typical float voltage for monitoring and maintaining is between 2.25 and 2.30 volts per cell at 25˚C/77˚F.