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Shep

Posted 4/1/2015 11:28 AM (#762821 - in reply to #762805)
Subject: RE: Battery Charging-does this make sense

Posts: 5874

Not sure what you mean by a technician at Interstate Battery. Sales guy at a store that sells Interstate? The guy that installs them? or did you actually call Interstate and ask for Tech Support? Either way, the guy you talked to is just wrong.

Wet cells should be charged at no more than 10A. It will take a 20A rate, but the higher the current, the more heat at the post connection, and that will, over time weaken the battery. Heat is not a friend of batteries.

AGM batteries have much lower internal resistance, and can be charged at a much higher rate without the heat buildup of the wet cell.

AGM batteries are sensitive to overcharging. FLoat voltage should not exceed 2.30 volts per cell, or 13.8 volts for 12V battery. Some chargers can be configured for the different battery types. Others cannot, and I know of no charger that can sense whether a battery is AGM or wet cell.