Sterling ProCharge Ultra Marine Battery Charger &ndash; 12 or 24 Volt Systems 12 or 24 Volt Systems (Remotes are sold separately from the battery charger.) 11 Pre-programmable settings - AGM, Gel, Flooded, Sealed, LiFePO4, or create your own custom profile. Advanced charging profile with storage mode for longer battery life. Digital display indicates both volts and amps, plus % output and system status. 5 year warranty.