electromotive
Posts: 33
Joined: Wed Aug 10, 2016 9:57 am
Delivery Date: 16 Jun 2011
Leaf Number: 003243

2011-2012 HV battery reset

Wed Sep 28, 2016 12:37 pm

Has anyone else noticed the growing number of used LEAFs offered for sale with 10, 11, and 12 capacity bars? This is fraudulent activity and California authorities may want to investigate.
Thank you to anyone that responds with his/her thoughts on this matter.

baustin
Posts: 656
Joined: Tue Feb 24, 2015 1:23 pm
Delivery Date: 09 Mar 2015
Leaf Number: 402162
Location: North Las Vegas, NV

Re: 2011-2012 HV battery reset

Wed Sep 28, 2016 3:37 pm

It is only fraudulent activity if the BMS is purposely reset to hide the true state of the battery. There are also several software updates applied by Nissan dealers that reset the BMS as part of the update. If the car is showing less than 12 bars, then it is not likely that it has been reset. The AHr reading stays constant, even with a reset, so checking with LeafSpy is the only way to know for sure on a 12 bar car.
2013 Leaf SV - Cayenne Red - QC Port - LED Headlights

AntronX
Posts: 83
Joined: Sun May 22, 2016 12:17 pm
Delivery Date: 14 May 2016

Re: 2011-2012 HV battery reset

Wed Sep 28, 2016 4:19 pm

I am pretty sure Ah gets reset also. Here are screenshots from Leafspy before and after battery reset via special dealer tablet computer (Consult?).

Image

jkline
Posts: 102
Joined: Mon May 02, 2016 10:46 am
Delivery Date: 01 May 2016
Location: Eastern, WA

Re: 2011-2012 HV battery reset

Wed Sep 28, 2016 8:22 pm

Just what is fraudulant about selling a used car that shows battery loss?

cwerdna
Posts: 8207
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: 2011-2012 HV battery reset

Wed Sep 28, 2016 9:52 pm

jkline wrote:Just what is fraudulant about selling a used car that shows battery loss?

Nothing. The fraud is with resetting the BMS so that it looks like it still has all 12 bars or that it has more than it had before the reset.

http://daveinolywa.blogspot.com/2014/11 ... -read.html has pointer to an example of a reset.

It takes awhile before the BMS relearns the battery and the # of capacity bars is accurate again.

'13 Leaf SV w/premium package (owned)
'13 Leaf SV w/QC + LED & premium packages (lease over, car returned)
'06 Prius

Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

Umpa
Posts: 1
Joined: Thu Jun 07, 2018 10:12 am
Delivery Date: 07 Jun 2018

Re: 2011-2012 HV battery reset

Thu Jun 07, 2018 10:15 am

For everyone else - Does resetting the BMS allow the car to drive more miles on a charge given it does not throttle the charging ?

If so then I don't see any harm in owners with paid batteries doing it.

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davewill
Posts: 4956
Joined: Thu Mar 17, 2011 6:04 pm
Location: San Diego, CA, US

Re: 2011-2012 HV battery reset

Thu Jun 07, 2018 10:42 am

electromotive wrote:Has anyone else noticed the growing number of used LEAFs offered for sale with 10, 11, and 12 capacity bars? This is fraudulent activity and California authorities may want to investigate.
Thank you to anyone that responds with his/her thoughts on this matter.

Big assumption. Cars from some places don't degrade rapidly, and a number of those cars will have had battery replacements, so those cars are probably legitimate. However, I do think that battery status (age, capacity) may ultimately need to be disclosed in a way similar to odometer readings.
Last edited by davewill on Thu Jun 07, 2018 10:48 am, edited 1 time in total.
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2011 LEAF SL w/QC, Blue Ocean, returned at end of lease

goldbrick
Posts: 224
Joined: Tue Aug 01, 2017 3:33 pm
Delivery Date: 01 Aug 2017
Leaf Number: 311806
Location: Colorado front range

Re: 2011-2012 HV battery reset

Thu Jun 07, 2018 10:44 am

Umpa wrote:For everyone else - Does resetting the BMS allow the car to drive more miles on a charge given it does not throttle the charging ?

If so then I don't see any harm in owners with paid batteries doing it.


No extra range is gained since the battery only has whatever capacity it has. The charging circuity will still limit the current flow in/out of the battery and the max/min voltage it allows the battery to reach. Resetting the BMS does nothing except corrupt the firmware that calculates and indicates the available battery capacity.

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