Join Date: Dec 2004
Location: Bedford Hts, OH, USA
The BMW battery tender will not charge a fully dischared battery. You'll need an old fashon dumb battery charger to get it at least partially charged over 3 volts. You should be able to get it charged then keep it on the "tender" and chances are the battery will be ok. As mentioned above be sure you get a gel tender if you have the gel battery.
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2019 K1600b Grand America, Blue Max.