Monday 29th July

Nothing much to report today.

Estimated range this morning was 48 miles, but it looks like it was heading for about 45 miles actual range. As on Friday I think the range was tailing off faster toward the end, but not significantly enough to be sure or to make a fuss about.

There was an interesting suggestion from Steve-o on gm-volt.com:

That's excellent documentation, and your explanation at the end of the July 28 entry sounds very plausible. If this were a laptop, I would say one cell of the battery had shorted, which often causes a laptop battery to drop from 15% to zero in a split second. Of course, there are a lot more cells in a Volt battery than a laptop battery, but I wouldn't be surprised if something like that were going on, or maybe a controller issue as SteveC5088 said, since you have had two batteries. It seems like the dealer should have some kind of diagnostic tool that could test for this issue.

I must read up on battery faults, but I have this horrible feeling the problem may indeed be with the battery.

Anyway, a few photos from today to demonstrate the mileage. Starting with the 48 mile range estimate:

 Arrived at work 14 miles later, 15 miles gone from the estimated range.

 Still showing 33 miles when I left work, 20 miles later the range has only gone down 18 miles:

 3 miles further on, but 6 miles gone from the range:

 and another 2 miles and range has gone down by 3 miles: