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Re: Battery warranty advice for 2014 Spark

Posted: Thu May 12, 2022 10:10 pm
by Infinion
MisturChips wrote: Thu May 12, 2022 9:50 am
The 2014 has a 3.17 final drive and the 2015-16 has a 3.87 final drive, so that's the main difference.


I think they changed the drive ratios in order to compensate for 100 less lb-ft of torque. I Recall hearing the LG cells couldn't take the punishment. I DO enjoy the zippiness! With the lower final drive, does that mean the speed limiter is a lower value?

Bumped in to another 2014 at the charging station last night and checked his stats. with ;only' ~92Kmi on his, the pack was still at 45.2Ah. Mine is down to 39.1 with 97.5K, and I have 10 days to go....
Oh man that really sucks. You'd have to take a road trip to a state with freezing temperatures right now, find a hill, wait for the pack to freeze, and then regen down it to degrade the pack in time, while also booking an appointment to check capacity on the last day... Definitely not impossible but, you might be better off rejuvinating your pack's capacity considering it's doing so well. Replacement only really guarantees you get your Ah back to, what, 20% degradation minimum? You could probably do that to your original pack.
I think they changed the drive ratios in order to compensate for 100 less lb-ft of torque. I Recall hearing the LG cells couldn't take the punishment. I DO enjoy the zippiness! With the lower final drive, does that mean the speed limiter is a lower value?
Do you know where you heard that? I was having a discussion with Porsche a while back in viewtopic.php?p=28503 speculating about the max discharge power of a high voltage lithium pack using cylindrical cells as a reference, because I didn't actually have access to pouch cell discharge data. From my own knowledge reading the service manuals, I'm pretty sure the Busbar max current is not more than 400A, so it'd be really interesting to at least hear where things stand for INR voltage sag vs LFP in the spark and if it's a little different or very very different between a single string of high capacity pouches against several parallel strings of cylindrical cells.

Re: Battery warranty advice for 2014 Spark

Posted: Fri May 13, 2022 6:59 am
by MisturChips
I think they changed the drive ratios in order to compensate for 100 less lb-ft of torque. I Recall hearing the LG cells couldn't take the punishment. I DO enjoy the zippiness! With the lower final drive, does that mean the speed limiter is a lower value?
Do you know where you heard that? I was having a discussion with Porsche a while back in viewtopic.php?p=28503 speculating about the max discharge power of a high voltage lithium pack using cylindrical cells as a reference, because I didn't actually have access to pouch cell discharge data. From my own knowledge reading the service manuals, I'm pretty sure the Busbar max current is not more than 400A, so it'd be really interesting to at least hear where things stand for INR voltage sag vs LFP in the spark and if it's a little different or very very different between a single string of high capacity pouches against several parallel strings of cylindrical cells.
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I recall discussing it with a salesman about how the torque was limited on the early-2015's though 2016 due to possible battery issues. I never substantiated it, but that's one reason why I jumped on the 2014 when it was available. 120KW on the dash meter during acceleration is nice - where do the 2016's peak?

Re: Battery warranty advice for 2014 Spark

Posted: Fri May 13, 2022 9:25 am
by niik
Update from GM on my battery replacement.

GM received the part that we were waiting on (95418638). However, the part failed QA checks and is not usable. According to my GM rep that was the last one anywhere and it has been discontinued. So now they are going to offer me a "buyback." I have not received the offer from them or the dealer so I don't know how much they plan to offer me.

Does anyone know what to expect from a buyback?

Re: Battery warranty advice for 2014 Spark

Posted: Sat May 14, 2022 10:19 am
by ElDobro
You may want to post that all over media that the battery is discontinued. Who is "they" that's offering you a buyback, is it the dealer, or GM themselves that contacted you?

Re: Battery warranty advice for 2014 Spark

Posted: Sat May 14, 2022 6:00 pm
by niik
ElDobro wrote: You may want to post that all over media that the battery is discontinued. Who is "they" that's offering you a buyback, is it the dealer, or GM themselves that contacted you?
They are GM corporate. However, GM said they would talk with the dealer to determine what the offer will look like.