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New Battery - Better update computer

Help, Advice, Owners' Discussion and DIY Tutorials for the groundbreaking new Volvo S60 2011+, V60 2015+ XC60 2010-2018.
XC60aches
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XC60aches

New Battery - Better update computer

Post by XC60aches » Mon Feb 03, 2020 3:09 pm

Ok... I learned a lesson today. So 15 months ago, I replaced the battery with a higher AH and CCA rating. I did NOT update values in VIDA, just a manual BMS reset by unplugging the BMS unit. Lately I have been having a low voltage issue. First the start/stop Stopped working for charging, then I would eventually get the low voltage flag.

I was a bit stumped.. battery would check good when tested. Battery at idle was 14.8. Parasitic amp draw tested good. On OBD diagnostics the battery SoC would never ever exceed 81% even when fully charged with external charger and would continually drop.

Come to find out the 14.8 at idle was a little high. When driving the alternator module would request 14.8 to 15v. BMS values matter, It was over charging due to not changing the values within the computer. It was slowly killing my battery.

Today I had the values changed in VIDA and not at idle it is hanging between 13.9 and 14.2. And now my SoC is slowly increasing... currently 86% after 30 miles of driving.

Just wanted to pass this on, because nowadays a battery change isn’t just a simple battery change. Passing on my learned lesson.

Note: 2015.5 XC60, 2.0L

Current battery (15 months old): super start platinum 94R AGM 900 CCA

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RickHaleParker
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Re: New Battery - Better update computer

Post by RickHaleParker » Mon Feb 03, 2020 8:32 pm

The 2015 must be using the a Coulomb Counting Method instead of the voltage/current method to monitor State Of Charge.
I wonder when Volvo converter to Coulomb Counting .... ?
--------
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, B8444S TF80 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger. V8 conversion in progress.

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regent
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regent

Re: New Battery - Better update computer

Post by regent » Fri Feb 07, 2020 10:08 am

RickHaleParker wrote:
Mon Feb 03, 2020 8:32 pm
The 2015 must be using the a Coulomb Counting Method instead of the voltage/current method to monitor State Of Charge.
I wonder when Volvo converter to Coulomb Counting .... ?
Ha-ha, the Swedish Elves decided to count the electrons one by one, this method is far more accurate :lol:
Example of Precision: Measure with a Micrometer, mark it with Chalk, and then cut it with an Axe.
Disclaimer: We (very) seldom do that

2015 BMW 335i
2015 XC60 T5 Premier Plus
2002 S60 2.4 n/a - retired :(
1987 340 DL - retired :(

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