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Old 02-29-2016, 06:17 AM   #4
Rogerh
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City: Niceville, FL
Country: USA
Vessel Name: At Last
Vessel Model: 1990 Jefferson 52 Marquessa
Join Date: Aug 2013
Posts: 724
Yes, sounds like it is being boiled out by the charger. This is often not the charger that is the problem though. It can be caused by one of the batteries connected to the charger having a shorted or weak cell. I would turn charger off for a few hours and then measure battery voltage, should be about 12.4 volts. Then hit thruster (assuming the batteries are for the thruster) for 5 seconds or so. Check voltage again and if it is down by more than two tenths of a volt I would suspect battery replacement is due. In my experience overcharging is most of the time caused by a defective cell.
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