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      12-31-2012, 09:18 AM   #5
seanblee's Avatar
United Kingdom

Drives: E92 335i SE
Join Date: Dec 2008
Location: Enfield, UK

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The batteries are either lead calcium or AGM. The E9x has IBS (Intelligent Battery System) that theoretically needs to be told when you replace the battery, even if it's like-for-like - this takes about 2 minutes with INPA or Tool32. Some people replace without telling the car, but I've seen stories that this kills the new battery as the system doesn't recalibrate the charging voltage - sounds a bit like urban myth to me, but up to you if you want to take the risk!

If you replace with a different capacity or type, this needs recoding (ideally through an update to the vehicle order), which takes probably 5-10 minutes with NCS). Codeable battery options are:

E B046                  BATT_46AH                         //46 Ah-Batterie
E B055                  BATT_55AH                         //55 Ah-Batterie
E B070                  BATT_70AH                         //70 Ah-Batterie
E B080                  BATT_80AH                         //80 Ah-Batterie
E B090                  BATT_90AH                         //90 Ah-Batterie
E A070                  BATT_AGM_70AH                 //70 Ah-AGM Batterie
E A080                  BATT_AGM_80AH                 //80 Ah-AGM Batterie
E A090                  BATT_AGM_90AH                 //90 Ah-AGM Batterie
To tell what type of battery you have now, check the top of the casing. The capacity will be marked on it; lead calcium batteries are white and AGM batteries are black.

FTR, BMW don't make batteries. The standard batteries are made by a variety of manufacturers - I've seen Exide standard and Banner AGM, so these are both safe bets.
2007 E92 335i SE auto | Quaife LSD | Birds B3 ARBs | Evolve Stage 1 | Morel Hybrid 402 | Rainbow IL-W8F | JL 10W3v3 | RF 3sixty.3 | Alpine PDX-V9