Quote:
Originally Posted by Chucklez
Also if it matters last time I had my X5 into my personal mechanic (which was to replace the alternator and the alternator bracket) he said something about the programming of the car thinking it had a AGM battery in it so he switched it to think it has a normal battery in it.
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Most newer BMW cars need programming when changing the battery but the E53 X5 is NOT one of them. If your mechanic said he re-programmed the car for the battery, I'm left wondering what it was he actually programmed - or thought he programmed.
*edit* Unless your mechanic meant he somehow adjusted the alternator output to suit the new battery.
AGM batteries require slightly less charging voltages than flooded cell batteries and a standard charge voltage of 2.4v per cell (14.4v total) as most cars charge at will overcharge an AGM battery in the long term. AGM is better of at 13.5v -13.8v for long term charging but the vehicle normal 14.4v is ok most of the time.
Most folk seem to have no trouble when fitting an AGM battery to a car designed for flooded cell batteries (such as the E53 X5) but in a few cases where long driving is common, the life of the AGM battery may be shortened by overcharging.