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Old 02-01-2019, 09:59 PM
landshark1169 landshark1169 is offline
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Mein Auto:
Battery replacement due to cold weather - 95 AH vs 90 AH AGM

Hi all - Temps got super cold in the Boston area and my 2011 X3 2.81 started throwing codes like they were rice at a royal wedding. I also got the dreaded low voltage and drivetrain malfunction error (limp mode) errors as well (P090 - misfire on #6, likely related to the coil which I have replaced in the past). I was pretty sure they were due to me having an original (so 7.5 yr old) battery, so I replaced the battery. Wanting to go big or go home, I went from a 90 Amp Hour (AH) AGM battery to a 95 AH AGM battery. I was tempted to go from the 8H battery size/amp hour to a 9H, but reigned myself in (would have gotten 110 AH!). The car is now a daily commute-to-train driver, so 5 miles a day net both ways (low usage relative to start load).

I also have the Rheingold (ISTA) software on a laptop so was able to register the battery, so I'm good on that front.

Here's my question. My previous battery was (fortunately) a 90 AH AGM. I've replaced it with a 95 AGM battery. I don't have ISTA-P for programming (that I know), just ISTA-D/Rheingold. I know that you should reprogram your VO if you change battery specs (especially traditional lead vs AGM) so the computer knows how to handle the new battery, but as I'm going from 90 AGM to 95 AGM, do I need to invest in INSTA-P and reprogram or am I ok leaving the programming as it is and running a 95AH battery under 90AH settings? Again, I did run ISTA-D to re-set the battery.

Any thoughts appreciated.

Thanks!

Mike
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Old 02-05-2019, 06:54 AM
DRP6833 DRP6833 is offline
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Mein Auto: 2013 X3 28i
I replaced the original battery in my '13 a couple weekends ago, also with a 95 AH AGM. I invested in the Carly app and OBDII interface specifically to register the new battery, but there was no option for a 95 AH battery and per the Carly instructions I set it for a 90 AH. So, in your case, I think you'll be OK.
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Old 02-05-2019, 08:02 AM
landshark1169 landshark1169 is offline
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Mein Auto:
Thanks DRP! I did notice in the various write-ups of how to code the battery they didn't give options for 95AH, as you experienced, so I guess it's the only choice. Again, thanks for the reply!
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