Originally Posted by MTribe
Report back if you try the braille... curious how long the car can sit with one of those. Thanks.
Honestly, I'd recommend getting a trickle charger, or install a battery switch.
also, depending what year your car is, make sure you have a way in and out of the trunk when you disconnect the battery, they took out the trunk key on some of the more recent models and people have locked themselves out completely.
even with the stock battery, the BMWs have so many electronic systems that the battery really doesn't last long.