timsmood8

Loss of miles / charge

Mon Nov 06, 2017 7:19 pm

I have owned my Bolt for about 2.5 months. We love our new car. I do have a concern about recent mileage loss when fully charged. Three weeks ago we left for a two week vacation. We would normally show 225 - 235 miles to go when fully charged. When we left for our vacation, our car had 200 miles left on the charge. We returned 16 days later. When activated upon our return, the mileage showed 199 miles left. Good so far. After driving it for a couple of days we needed to charge again. When the battery was fully charged, it showed 195 miles left at full charge. Since then we have charged it two more times. The first of these it showed 190 miles left on a full charge. The last time we charged, 192 miles remaining on a full charge.

I realize that the calculations for mileage are very dependent on the driving style of the owner but my driving style has not changed. Is there something to the problem of leaving the car sit for two weeks + that would suddenly show fewer remaining miles when fully charged?

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IMAdolt
Posts: 136
Joined: Mon Jan 09, 2017 7:13 pm

Re: Loss of miles / charge

Mon Nov 06, 2017 10:25 pm

timsmood8 wrote:I have owned my Bolt for about 2.5 months. We love our new car. I do have a concern about recent mileage loss when fully charged. Three weeks ago we left for a two week vacation. We would normally show 225 - 235 miles to go when fully charged. When we left for our vacation, our car had 200 miles left on the charge. We returned 16 days later. When activated upon our return, the mileage showed 199 miles left. Good so far. After driving it for a couple of days we needed to charge again. When the battery was fully charged, it showed 195 miles left at full charge. Since then we have charged it two more times. The first of these it showed 190 miles left on a full charge. The last time we charged, 192 miles remaining on a full charge.

I realize that the calculations for mileage are very dependent on the driving style of the owner but my driving style has not changed. Is there something to the problem of leaving the car sit for two weeks + that would suddenly show fewer remaining miles when fully charged?


What's the weather like?

iletric
Posts: 172
Joined: Wed Dec 14, 2016 4:50 am

Re: Loss of miles / charge

Mon Nov 06, 2017 11:32 pm

Ambient temp can do some real damage to your range. As soon as night temps hit 40s or less, you'll see a substantial loss of GOM range.

Also, do charge every night even if you drive 10 miles previous day. Battery does not take deep discharges well. Keep it full as much as possible to prevent premature range loss due to accelerated aging.

Full battery with no driving for a few days is not a problem. I think that's been debunked long time ago.

ArthurL
Posts: 104
Joined: Sun Feb 12, 2017 9:26 pm
Contact: Website

Re: Loss of miles / charge

Tue Nov 07, 2017 7:03 am

in the mid 20s F. here and my range is about 20 percent down.

timsmood8

Re: Loss of miles / charge

Tue Nov 07, 2017 5:47 pm

Hey - thanks for the help. I will be sure to put it on the charger every night. Thanks again.

elpwr
Posts: 92
Joined: Fri Jan 15, 2016 1:38 am

Re: Loss of miles / charge

Tue Nov 07, 2017 11:36 pm

Lithium batteries show minimum degradation when kept around 50% SOC. There’s plenty of evidence in technical papers and EV manufacturers such as Tesla to support this. Keeping the battery “as full as possible” is not good advice.

michaellax
Posts: 102
Joined: Wed Sep 06, 2017 4:21 pm

Re: Loss of miles / charge

Wed Nov 08, 2017 1:06 am

I am going to repeat this post from another thread:

I enjoy the Grande size Starbucks coffee but it tends to splash out when driving through the cover's drinking hole.

I used to have them not fill it to the top to avoid this problem, but then over the long run, I was wasting money getting less coffee than I was paying for.

Finally, I ordered a Grande coffee in a Venti sized cup and the problem was solved. Then they developed a plastic green stick to plug closed the drinking hole in the coffee cup's cover and now I am back to my Grande cup again.

I waited for the Bolt EV because I wanted a 238 mile capacity car not an 80-100 mile capacity car or a 150 mile capacity car.

I find that most, if not all of those members of this forum who criticize full charging of the Bolt EV drive a different EV; ask them!

Nobody knows what engineering GM has provided to protect the battery but anecdotal evidence from drivers of the Spark EV and Volt suggest that those cars have suffered from low battery capacity loss over the last few years; ask them!

While the LEAF is the main capacity loss culprit for the last few years.

I am sticking with full charging my 238 mile Bolt EV.

iletric
Posts: 172
Joined: Wed Dec 14, 2016 4:50 am

Re: Loss of miles / charge

Wed Nov 08, 2017 5:42 am

ArthurL wrote:in the mid 20s F. here and my range is about 20 percent down.
That's to be expected. Once winter's over and we hit 50s at night, your range will be back to original.

Winter driving is hard on range because on top of the loss you have to use a lot of heat. This is why it is do nice to have a 230 mile EV. Even with the loss of range it still has enough miles to call it a real car.

elpwr
Posts: 92
Joined: Fri Jan 15, 2016 1:38 am

Re: Loss of miles / charge

Wed Nov 08, 2017 1:22 pm

I have a Tesla and a Bolt.

Charge my Tesla to 100% repeadly for a few days and you get the on screen message: “frequent full charging will result in premature battery degradation. Fully charge only when necessary for trips”

JB Straubel, Teslas chief engineer has stated the 50-62% storage range minimizes degradation.

There’s plenty of other evidence, published by experts, to confirm that the upper and lower extremes of SOC hasten li-ion battery degradation.

I won’t engage in an argument over this. But the “deniers” just don’t have the weight of evidence on their side.

iletric
Posts: 172
Joined: Wed Dec 14, 2016 4:50 am

Re: Loss of miles / charge

Wed Nov 08, 2017 10:35 pm

We drove Spark 42,000 miles over 3 years with almost no loss of original range, doing full charge every night. I figure Bolt batteries, being of the same provenance as Spark's (LG chemistry), will over time perform in a same manner.

But we'll see. So far at 23,000 miles the Bolt battery has not blinked. I expect max of 10 miles drop at 50,000. Hopefully less.

Tesla has Panasonic chemistry. Different animal.

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