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Originally Posted by DHS
If you use a trickle charger you will eventually overcharge the battery and ruin it.
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Myth. From the BMW charger link above: The device's on-board microchip monitors and regulate the charge- virtually eliminating sulfation.
It can even help extend the life of your battery. That technology isn't unique to the BMW charger by any means. Older chargers that don't use microchip regulation are nonetheless still regulated.
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The best what you can do is go to your dealer and buy the original charger for your car, check the link
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The only thing which makes the BMW charger different from any other charger with similar specs is the BMW logo.