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otrfun's avatar
otrfun
Explorer II
Sep 20, 2014

Using "Gel" Battery Tender Plus on Lead-Acid Battery

Been charging my 12v, 24-series, lead-acid RV battery with a "Programmed for Gel" Battery Tender Plus for the last few days. Used to use this BTP on my BMW motorcycle which had a Gel-cell battery. I've heard it's ok to use the Gel-cell BTP on lead-acid batteries--but, maybe not.

Even though the indicator lights show a 100% charged battery (steady green light, float mode) after 24-48 hours or so, I still read 13.7 volts at the battery terminals with this BTP connected and on. Shouldn't it drop down to approx. 13.2v at some point? Won't 13.7v eventually overcharge a lead-acid battery?

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