MrDRMorgan
Posts: 1132
Joined: Wed Oct 30, 2013 7:27 am
Location: Manteca in Central California

Re: Battery degredation

Sun May 17, 2020 1:23 pm

ChadTi99 wrote:
Sun May 17, 2020 1:02 pm
Just wanted to share my battery degradation experience. I purchased my 2016 Spark EV In October of 2019 with around 23k miles and the initial reading was 15.47kwh. Now at 28k miles the latest reading was 14.40kwh just a few days ago. I’ve tried my best to baby the battery and I’ve only fast charged once but who knows what the previous two owners have done.
I have a 2016 Spark EV 2LT that I purchased used with 6500 miles on the ODO. At 23k miles on the ODO my TorquePro battery capacity measurement was 15.7 kWh. At 28k miles it was 14.6 kWh and recently, at 30k miles, it measured 14.3 kWh.

On May 15, 2020 and at 30,332 miles on the ODO, the battery capacity measured 14.3 kWh with my most recent driving consumption being 6.3 mi/kWh. My current full-charge GOM reading is 90 miles. For the last 20k miles (almost 2 years), my mi/Kwh average has been 6.02 with a minimum of 5.03 and a maximum of 6.71. I anticipate crossing the battery degradation warranty point in about 2 years when the ODO reaches 60k miles.

CSW
Posts: 195
Joined: Tue Feb 17, 2015 8:37 am
Location: Sacramento,CA

Re: Battery degredation

Mon Jun 01, 2020 9:39 am

I have a 2016 Spark with 43k miles on it as of yesterday. I am not happy with the battery degradation......

I drove it yesterday until I had 1 mile of range left, the energy usage screen said I had used 13.2 KWh of energy at 99% usage.

So that means my battery capacity is now only 13.2 KWh !!!

WEAK!

Original capacity was states as 19 kWh.

SO has lost basically 6 KWh in 4 years??!!

At this rate, the battery will be ready to be replaced under warranty (maybe. hopefully, wishful thinking) in less than a year with
about SIX years AND 55 thousand miles left on the battery warranty.

Plus, soon I will not even be able to make my 50 mile round-trip commute on one charge! weeeeeak.

Plus plus, I just bought this spark a few months ago off its lease.

Did I make the wrong decision?!!?

I like my Spark, but this is very disappointing.

TheLondonBroiler
Posts: 227
Joined: Tue Oct 31, 2017 6:25 am

Re: Battery degredation

Mon Jun 01, 2020 10:35 am

CSW wrote:
Mon Jun 01, 2020 9:39 am

soon I will not even be able to make my 50 mile round-trip commute on one charge! weeeeeak.

Did I make the wrong decision?!!?

I like my Spark, but this is very disappointing.
I know the feeling all too well. With a 62 mile commute and fast chargers being taken offline in my area, the Spark didn't work for my driving anymore. I bought a Bolt (which I understand isn't feasible for everyone), and I don't worry about range anywhere near as often.

Only you can decide if you made the wrong decision. Personally, if I could do it again, I would have bought a Volt or just waited.
2015 Spark EV w/ DCFC 46,XXX miles
Purchased 1/20/18 w/ 16,5XX miles
0-40k mile efficiency avg - 5.3 mi/kwh

2019 Bolt EV w/ DCFC 59,XXX miles
Purchased 3/16/19 w/ 87 miles
Lifetime efficiency avg - 4.6 mi/kwh

MrDRMorgan
Posts: 1132
Joined: Wed Oct 30, 2013 7:27 am
Location: Manteca in Central California

Re: Battery degredation

Mon Jun 01, 2020 10:44 am

CSW wrote:
Mon Jun 01, 2020 9:39 am
I have a 2016 Spark with 43k miles on it as of yesterday. I am not happy with the battery degradation......

I drove it yesterday until I had 1 mile of range left, the energy usage screen said I had used 13.2 KWh of energy at 99% usage.

So that means my battery capacity is now only 13.2 KWh !!!

WEAK!

Original capacity was states as 19 kWh.

SO has lost basically 6 KWh in 4 years??!!

At this rate, the battery will be ready to be replaced under warranty (maybe. hopefully, wishful thinking) in less than a year with
about SIX years AND 55 thousand miles left on the battery warranty.

Plus, soon I will not even be able to make my 50 mile round-trip commute on one charge! weeeeeak.

Plus plus, I just bought this spark a few months ago off its lease.

Did I make the wrong decision?!!?

I like my Spark, but this is very disappointing.
This does not surprise me at all. I also have a 2016 Spark EV which currently has 30512 miles on it and a TorquePro measured battery capacity of 14.3 KWh as of 30 May 2020. My data shows I am losing 1.0 KWh every 7600 miles. But.... my average mi/KWh is currently running > 6.0 since February. I do not know why. My GOM read 93 miles after the last full charge on May 30.

Normally, I charge at home using a 3.3 KWh L2 EVSE. On the road I am not too concerned about battery degradation as long as I have "working" DCFC stations along my routes of travel. As an example, on Fridays, I usually have to drive from my my home in Manteca, CA to Oakland and back. This is a 135 mile round trip. I have access to a number of working DCFC locations along my route so I really do not give much thought to getting stranded. However, to be sure, there are many destinations that are one or more DCFC stations too far.

Right now I estimate I will hit the warranty replacement point at 60,000 miles.

CSW
Posts: 195
Joined: Tue Feb 17, 2015 8:37 am
Location: Sacramento,CA

Re: Battery degredation

Mon Jun 01, 2020 12:32 pm

Welp, I am committed to the spark now..... for better or worse as it is said.

If I can get my place of employ to install a 120v outlet for me to use, I will be golden as I drive
25 miles each way...... and stuck there 8+ hours a day, so even 4 miles an hour of range be great.

but that like a big deal to them, prob cost $100 bucks and I would pay them $200.....

It sure will be interesting to see how Chevy handles the warranty claims once they start coming in.......

I hope they want to avoid a whole LOT of negative reports of then NOT covering their battery warranties.....
would scare off a lot of people from buying EVs in general in the future.
--------
As a side note, our other car is a 2018 Volt..... 40k miles on it, no battery degradation so far it seems......
(12k miles on gas, 28k miles on EV motor)......

I find spark more fun to drive than Volt, but Volt is a lot more luxurious feeling over spark. :)

MoldyWalnuts
Posts: 24
Joined: Wed Jan 23, 2019 1:33 pm

Re: Battery degredation

Fri Jun 05, 2020 3:03 pm

a little background, i purchased my used June 2016 built Spark EV mid-March of 2019, so it was less than 3 years old then, as a lease return from the same dealer with 46K miles. my reasoning was to buy as fresh a HV battery as i could , regardless of miles on the clock. currently it has 54K miles. i've used a 400V charger twice during all this time and mostly get my juice from 120V at home with only a few 240V charges sprinkled in between. i never let the charge get too low, but when i charge it's always to 100%. GOM range used to show around 100 miles at full charge, this was mostly throughout 2019. since about the beginning of 2020 my GOM range started showing 80 miles when fully charged, quite a drop and i'm not sure why.

is it possible to calculate HV battery capacity without using any tools such as TorquePro, etc.? if so, please explain how one would do so. thank you

TheLondonBroiler
Posts: 227
Joined: Tue Oct 31, 2017 6:25 am

Re: Battery degredation

Fri Jun 05, 2020 3:11 pm

MoldyWalnuts wrote:
Fri Jun 05, 2020 3:03 pm
is it possible to calculate HV battery capacity without using any tools such as TorquePro, etc.? if so, please explain how one would do so. thank you
If you charge to 100% and drive until the energy usage screen says you've consumed 50%, look at energy used (kwh) and multiply by 2. That should be pretty close to the actual figure. Some on the forum say you should do this driving with as little regen possible (ie driving on a clear interstate), and I tend to agree.
2015 Spark EV w/ DCFC 46,XXX miles
Purchased 1/20/18 w/ 16,5XX miles
0-40k mile efficiency avg - 5.3 mi/kwh

2019 Bolt EV w/ DCFC 59,XXX miles
Purchased 3/16/19 w/ 87 miles
Lifetime efficiency avg - 4.6 mi/kwh

MrDRMorgan
Posts: 1132
Joined: Wed Oct 30, 2013 7:27 am
Location: Manteca in Central California

Re: Battery degredation

Fri Jun 05, 2020 4:25 pm

TheLondonBroiler wrote:
Fri Jun 05, 2020 3:11 pm
MoldyWalnuts wrote:
Fri Jun 05, 2020 3:03 pm
is it possible to calculate HV battery capacity without using any tools such as TorquePro, etc.? if so, please explain how one would do so. thank you
If you charge to 100% and drive until the energy usage screen says you've consumed 50%, look at energy used (kwh) and multiply by 2. That should be pretty close to the actual figure. Some on the forum say you should do this driving with as little regen possible (ie driving on a clear interstate), and I tend to agree.
Also, try to maintain a constant speed and avoid headwinds or tailwinds.

CSW
Posts: 195
Joined: Tue Feb 17, 2015 8:37 am
Location: Sacramento,CA

Re: Battery degredation

Fri Jun 05, 2020 5:31 pm

The GOM is not a good way to figure battery capacity, it can vary widely.

I would follow the advice of driving till 1/2 empty and check.

MoldyWalnuts
Posts: 24
Joined: Wed Jan 23, 2019 1:33 pm

Re: Battery degredation

Fri Jun 05, 2020 5:34 pm

thank you, that makes sense since to get a somewhat accurate calculation you don't want to reduce the kwh used by using regen or get a "push" from tail wind or a "push-back" from a head wind, etc, just discharge the battery with little to no external forces applied. i'm also assuming that getting an occasional push from your significant other won't help the estimate either ;)

i'll give it a try and post the result.

Return to “Batteries and Charging”