E91 replacement battery - options

[Martyn76]

Hi All,

Looking to replace the battery in my 06 E91, current battery is 90Ah which doesn't seem to be widely available, if I went with a higher rated battery, 100Ah for example would I need to get the battery recoded at all or is that only when going with a smaller battery like an 80Ah?

TIA

[JakeT]

Not all E91s have IBS, but if you go larger or smaller you need to code it.

[pmorg4]

If your car has IBS, even if you don't need to code it (swapping like for like) you should register it so that the system knows that a new battery was installed.

Easiest way to tell whether your car has IBS is to look for the little control box fitted to the negative battery terminal.

[Mr Tidy]

My 06 plate E91 325i didn't need the new battery to be coded, but then it was built in August 2005!

Hopefully yours won't either - it's cheaper that way.

[stevemcs]

Try a main dealer, we often find some are cheaper than aftermarket.

[VeeTenM]

Tayna batteries were cheapest delivered for me when I got my M6 battery. You can use FACEBOOK45 for 5% off

[voram]

stevemcs said:

Try a main dealer, we often find some are cheaper than aftermarket.

Yes, and you don't get stuck with an old battery to dispose of. Having said that, I'm a regular Tayna customer as well.