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With all the high tech gadgets, the X5 does seem to deplete the battery faster (based on charging time) than other cars I've owned, including previous BMWs. I use the BMW charger, pricey but a modest investment compared to other accessories, and certainly one that gets used. I notice the new tender has a Li Ion setting as well, although I just set it to Auto once a week and let it go. Generally takes 6-12 hours for a top up.
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