Join Date: Aug 2008
Location: Topeka, KS, USA
Re: Battery voltage & charging - '05LT
Get a regulated or "floating" charger. My favorite is the Guest brand 2606. It puts out three levels of charging and will "float" so it will not damage your battery. The easiest thing to remember is to get a charger which is compatible with AGM batteries and you're done. The AGM and gel batteries top off at lower voltages so the chargers used with them are good for regular batteries as well. An AGM or gel battery which gets overcharged though is ruined. Your voltage regulator on the BMW will cut out at about 13.6 which is ok for any battery you'll put in it. My personal opinion is that the AGM batteries offer the best value.
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