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Re: Analysis of a replacement battery.

Posted: Tue Jul 13, 2021 8:44 pm
by JejuSoul
shumanchu wrote:...Is the BMS firmware different for the different battery chemistries? My '16 Kia Soul EV recently got a 37510-E4200R battery replacement. I noticed that the SOH still reads 68.4%, same as when I brought it in. I assumed that they would need to update the BMS firmware to handle the new chemistry, and that doing so would reset the SOH back to 100 (or 110?) percent...

Yes. Here is a list of the various ROM-IDs for each of the BMS Firmware updates on the original Soul EV.

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This is badly translated from the Korean as is so often the case with Hyundai / Kia.
E4050 - 'Elevated Temp' actually means with Battery Heater.
E4000 - 'Non-Heating' means without Battery Heater.

That you have a 37510-E4200R signifies the new pack has the new cells, has no battery heater and is 're-manufactured'.
What 're-manufactured' means in this case is uncertain. Did they take old cells out of a broken 30kWh car.?
Did they mix and match old and new cells? We don't know yet. We just know there is a big price difference.

Looking at the Kia parts website - Kia Soul EV Re-manufactured Battery (37510-E4250R)
This battery costs $1,609.50 and fits all models both 27kWh and 30kWh.
It is just the cells, they reuse the case and other electronics so this is for cars with and without battery heater.

Looking at the Kia parts website - Kia Soul EV Replacement Battery (37510-E4250)
This battery costs $12,293.25 and fits all models both 27kWh and 30kWh
It is just the cells, they reuse the case and other electronics so this is for cars with and without battery heater.

They add a $2,500USD core charge to both.

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That your SOH hasn't changed shows that they forgot to update the BMS. This is an essential step for non re-manufactured packs.
We don't know the requirements for 're-manufactured' packs. Presumably though it should be the same.
I would take the car back and ask them to update the BMS.
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Re: Analysis of a replacement battery.

Posted: Wed Jul 14, 2021 9:53 am
by shumanchu
Ok, from that table it looks like I have probably have BMS ROM ID 5522 and what I need is BMS ROM ID 5722. This information is covered under Kia TSB ELE 155 (upgrade action 379.PS).

Getting this battery replacement has been a nightmare. After 7 weeks with no car, I get my car back with a remanufactured battery instead of new, and with the incorrect BMS firmware to boot. They also left the High Voltage safety disconnect cover open, and there are multiple grease marks in the interior. I'll try to get them to re-flash the BMS to 5722.

After they re-flash, I assume I should do a drive cycle/charge cycle (below 10% SOC and uninterrupted charge back to 100% SOC)?