Battery seems to be charged, it will crank 90% of the time but once in a while i have to jump it off. this started when i left the dome light and rear inside light on all night and the battery lost charge.
Maintenance-free batteries really don't tolerate complete discharge very well. If the battery was already several years old, letting it go dead probably was the last straw, so now it may not hold a charge more than a day or two, or it may have so little capacity that if you start the car a couple of times without a long (20 min+) drive between starts to recharge the battery, it won't be able to start the car the next time without a jump. Probably time to go battery shopping.
You didn't mention your model, but many BMWs use unusual battery sizes (group #s). Most of us use a smaller, common size battery, or a larger (longer) battery because original sized batteries are hard to find at the retailers, and when you find one, it may not be very fresh. If your battery will only last six or seven years at best, you don't want to buy one that is already a year old, and has been sitting on the shelf partially charged for that year.
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