Charging a 12 Volt Battery With 18 Volts
Most lead-acid battery chargers will do the job just fine. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy Safety How YouTube works Test new features Press Copyright Contact us Creators. 12vdc Mobile Battery Charger Circuit Diagram Can Delivers Up To 20 V Output From The 12v Car Power Supply Mobile Battery Charger Mobile Battery Mobile Charger The problem is that when the generator runs it. . There are many reasons for it. So charging an 18v battery with a 12-volt battery may not be possible. During the last couple of days I have found that a battery with a reading of 18 volts as I encountered can be brought back to a fully charged 126 volts. The alternator is charging 17-18 volts at fast idle. It is quite possible these battery are dead as they came out of an uninterruptible power supply that is a few years old. Connect the positive side of the series connection to the positive side of ...