BMW 3-Series E46 - 03 3.0 Flat Battery - Recharge or Replace - L'escargot
>> I'm no technician, but I replace batteries after five years regardless of how well (or
>> not) they're performing.
>>
I have my battery replaced at the first sign of trouble. My last one lasted eight years ~ my franchised dealer brought the new battery to my house for no extra cost and fitted it in my garage. Franchised dealers are great.