E70 Battery Replacement - DIY

[smassey321]

Originally Posted by B4_685

very cool - might look in to this thanks man!

I just put a 95aH Varta in my N63 X5 but couldnt code 95aH - the only options were 90 or 105 - tried editing the trace file but ncsexpert flagged it so I just left it at 90 and registered via Ista+. Any experience trying to add a non-bmw battery of a rating not natively supported? Sorry if this thread is not appropriate to ask

I had the same issue. I just bought the 105ah AGM battery at the dealer. It was the same price ($200) as the lesser AH at the auto parts stores.

All US N63 engines now use the 105ah. https://static.nhtsa.gov/odi/tsbs/20...53642-9999.pdf

[B4_685]

Originally Posted by smassey321

I had the same issue. I just bought the 105ah AGM battery at the dealer. It was the same price ($200) as the lesser AH at the auto parts stores.



All US N63 engines now use the 105ah. https://static.nhtsa.gov/odi/tsbs/20...53642-9999.pdf

Thanks for the feedback/info. I will assume that the battery wont reach full charge and so will trickle charge it once a month or so to be on the safe side.


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[Kok-Boru]

Originally Posted by smassey321

I had the same issue. I just bought the 105ah AGM battery at the dealer. It was the same price ($200) as the lesser AH at the auto parts stores.

All US N63 engines now use the 105ah. https://static.nhtsa.gov/odi/tsbs/20...53642-9999.pdf

Thanks for sharing the link for the sib. Mine is a 2007 X5 4.8i. Just bought a 105ah agm battery from the dealer, and registered and coded myself using ista d/ista p.
In this sib, it says that E70/E71 models before 09/2010 although can fit a 105ah, we decided not to take this risk, because vehicle integrity could be compromised in an accident. So what are they saying exactly? But after I programmed and encoded a larger size using ista p, I went back to check if all was registered correctly in ista d- it said the current battery registered is 80 ah? I don’t get it. Or does the dme need some time to fully register the new battery rating correctly?
Sure the trey was too small, but I can just move the holding bracket few inches to the right. There’s a drain hole (larger than 10mm bolt), maybe 12 mm will fit there just fine, plus some drilling of the bracket would be required.
I guess my question is, has anyone here replaced their factory 92ah agm battery to an oem 105ah on their E70 X5s successfully and has been a happy camper?
Thanks!

[josiahg52]

A capacity rating without a discharge rate is useless. How does BMW measure the battery capacity? Is it 90, 105, etc. Ahs? At a 20A discharge rate? 15A? 25A? We don't know.

How does the battery manufacturer you choose measure their capacity? At what discharge rate? Capacities of batteries change at different discharge rates. The industry standard is capacity measured at a 20A duschsrge rate. This capacity is called the C/20 capacity.

Please read post #115 in this very thread.

[B4_685]

Originally Posted by josiahg52

A capacity rating without a discharge rate is useless. How does BMW measure the battery capacity? Is it 90, 105, etc. Ahs? At a 20A discharge rate? 15A? 25A? We don't know.

How does the battery manufacturer you choose measure their capacity? At what discharge rate? Capacities of batteries change at different discharge rates. The industry standard is capacity measured at a 20A duschsrge rate. This capacity is called the C/20 capacity.

Please read post #115 in this very thread.

Thanks for the direction - seems a bit more complicated than just matching a number.


2012 E70 5.0iX

[richardb]

Here's my DIY guide:

https://youtu.be/sFIW61jRP4k

Hope it helps!

[forum1]

Originally Posted by richardb

Here's my DIY guide:

https://youtu.be/sFIW61jRP4k

Hope it helps!

Watching this and your use of a tripod to prop open the cargo floor door reminded me how much I appreciated my 2007 E70 having a gas strut for this and how disappointed/annoyed I was to see BMW cheap out in later model years.

[josiahg52]

Originally Posted by forum1

Watching this and your use of a tripod to prop open the cargo floor door reminded me how much I appreciated my 2007 E70 having a gas strut for this and how disappointed/annoyed I was to see BMW cheap out in later model years.

The kit is available for the later E70s. Holes are there and everything. It does make them seem pretty cheap.

[richardb]

I was searching for some kind of strap/clip like what exists on the E53 lol. Now I know what my next upgrade is going to be!

[crystalworks]

Yep, bought it for ours. Was ~$30 if memory serves. Hilarious BMW didn't include it in all E70s. Bean counters...