In some dealerships- they have plugged into ECU with back cable running to a small box which has a suction cup to windscreen (cigg box sized) with light indicators (red-battery dead, yellow-add charge, green-good to go) it doesn't charge or anything (from what I can see) anyone have info on this? I'd like to purchase one as I park a BMW and at a glance would like to know how the battery is doing..
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