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That's right. The alternator is not always engaged to charge the battery. Instead, sometimes it trickle charge while the car is braking. So, driving the car for 100km on the freeway may not result in the battery getting recharged. BMW uses this as a fuel saving measure. It is definitely worthwhile investing in a battery charger especially with all these snap lockdowns and we are not driving our car as much. I pop mine on the charger every month or so to top it up… I was also told this also tends to extend the life of the battery.
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