Weak Cell and Collapsing Range

Just in the last week or so, I realized the SOC on my '13 Leaf was going down rather abruptly.

So, I used the Leaf apps to track what was happening. The surprise was, the Leaf apps would show higher SOC than what Leaf showed.

So, I manually noted SOC and the miles driven. As you can see below, the behavior is as expects between 100% and about 70%. Then again down below 20%. But between 70% and 20% I got just 10 miles !



Looking at Leaf Spy the reason seems clear. There is a weak cell #2 - though not sure why Leaf would behave this was only between 70% and 20%.



I took the Leaf to the dealer - the they ran their usual checks and said everything is fine. Is there a specific test they can run so that this problem shows up ? Has anyone got their dealer to replace the battery with such a problem ... ?

Question for Turbo and others is - why do you think Leaf spy etc are showing much higher SOC than Leaf was (for eg. at the end of this run Leaf spy still showed 24.6% SOC as you can see).

I think the test you want is here: http://www.mynissanleaf.com/viewtopic.php?f=31&t=19076&start=10#p411119

Also, at low SOC, my LeafSpy reports higher than the dash too. Just noticed that the other day.

Thanks for the link. I asked the dealer to do a CVLI test. They are talking to Nissan to figure out what to do.

moved to new msg, going to have my own battery replacement saga to share

You either have a bad pack or the BMS has been reset from a seriously low capacity reading (2 bars? one??) and is not yet back to an accurate reading. IMO it's likelier that you have a bad pack, which would actually be great news, believe it or not, as the manufacturing defect warranty is still in effect.

almost forgot about this thread. what was the resolution? did you get the cell replaced?