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  1. Battery Charging/Tender Thread (Merged)

    Electronics
    I tried charging my R9T battery using a cheap battery tender with a adaptor plug into the aux socket, it wouldn't work, I tried turn on the ignition and off, it worked for 5 min then off, then I found this charger on the website TecMate OptiMate 4 Dual Program Battery Charger for BMW CANbus -...
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