Posts: 16
Joined: Tue May 05, 2020 8:13 am

Re: Battery degredation

Sun Aug 09, 2020 1:21 pm

I've supercharged my eSpark over 300 times now and I still get 75 miles of hard highway cruising. The batteries are pretty bullet proof- if it can survive my lifestyle, considering I've put 40k miles on it in 22 months then it's going to work fine for someone who is softer to it for decades.

GM if you are listening and want to do analysis on my car (or the Bolt for that matter) hit me up, i'll give them hell ; )

Posts: 91
Joined: Sat Aug 31, 2019 1:05 pm
Location: NJ

Re: Battery degredation

Tue Aug 11, 2020 3:42 am

You can't get a 2014 Spark battery. GM printed a bulletin that gives you a list of parts you need to adapt the 2015/16 battery to the 2014. That's the same bulletin that says you also need to use the 2015/16 rear shocks too.
Do you have the bulletin number? Also, Paul Gipe on the Bolt forum has a great post regarding Bolt HV battery degradation. The Bolt battery looks to be very good with minimum degradation.
Here you go. 17-NA-003

Posts: 5
Joined: Sun Jul 26, 2020 4:48 pm

Re: Battery degredation

Mon Aug 24, 2020 8:39 am

Went through my first charge today. Energy screen says I used 15.2 kWh @89% used. I'm sure this has been discussed, that number doesn't take into account regen braking? In theory my capacity is 17.07 kWh or would it actually be less since I generated some power from braking?

Posts: 151
Joined: Sat Jan 14, 2017 4:11 pm

Re: Battery degredation

Mon Aug 24, 2020 9:00 am

The energy screen does take the regen braking into account.

If you go down a hill with a lot of regen, you will see the kWh and % go down together, so regen or not the extrapolated usable capacity calculated from these numbers will be the same regardless of how much regen you had.

Regen has nothing to do with capacity. Usable capacity is the amount that can be stored and used in the battery. Regen simply refills the battery while you drive so it gives you more energy, but it does not change the Capacity itself. If your battery is full, regen does not work as it cannot add anything more into the battery

The nominal usable capacity has never been officially published but is supposed to be around 18.5 or 19kWh. Depending on how much battery degradation you have, your usable capacity will be lower. I am down to 13.6kWh on my 2014, and it has been on a steady decline form day one.

Posts: 2
Joined: Mon Aug 24, 2020 1:24 pm

Re: Battery degredation

Sun Oct 18, 2020 3:46 pm

My 2014 is down to 13.4 to 13.5 kwh. Has anyone tested the warranty waters yet? How much more would it have to go down before I could consider a warranty claim? I know this has been speculated on in other posts, but I've never heard of anyone who hit the magic number and got a replacement yet.

Also, since the 2014 battery is no longer, any idea what it would cost to convert to a 2015/16 battery should I choose to do that rather than simply sell the car?


Posts: 418
Joined: Tue Sep 06, 2016 1:18 am
Location: SF Bay Area (San Jose, CA)

Re: Battery degredation

Tue Oct 20, 2020 7:09 am

Posts: 151
Joined: Sat Jan 14, 2017 4:11 pm

Re: Battery degredation

Tue Oct 20, 2020 8:35 am

I don't think that the usable capacity of a 2014 is actually 21kWh, but no one knows for sure :)

I think assuming 18.5kWh usable is safer and so waiting until it drops under 12kWh usable should be the way to go if time permits.

Of course if your battery warranty is about to expire around 13kWh, I would have it checked by the dealer to see if it meets warranty requirement

Return to “Batteries and Charging”