Quote:
Originally Posted by joelbuckley
There's this thread: http://www.xoutpost.com/bmw-sav-foru...m-battery.html
One member (pete540) says he's using a BMW AGM battery in his e53 with no problems. That's good.
On the other hand, it seems maybe AGM can be damaged over time by charging voltage/current combinations that wouldn't harm wet cells, so, for example, you can't use any old charger, but need one made for AGM. I couldn't find any definitive statement that the e53 (in USA) charging system has the correct profile for AGM batteries. |
Actually, AGMs can use any battery charger...just as any wet cell battery. This is per Braille and Odyssey. Whomever said they couldnt use a normal charger was misinformed. The thread you linked to is full of misinformation. The alternators on new BMWs are even more powerful than the ones on those of yesteryear. They all have voltage regulators, or they'd overcharge ANY battery that they were attached to.
Deep Cycle Battery FAQ, or Absorbed Glass Mat Batteries
I have been running the Braille battery for 8 months now, in both my X and M5 (the M5 has been for 1.5 years, and required foam blocks to keep the battery in place as it is specced for a 95R). I dont have to leave the car not being driven on a tender, as the AGM holds its charge much much much better than a conventional BMW battery.
I would highly recommend the Braille 49 endurance for any BMW.