Hi David, My experience has been that all cells in the pack degrade together.
There have been few reports of sudden catastrophic capacity loss, which was then caused most likely by losing a cell in one module and since a module has 4 cells: 2 pairs that are series/parallel, so losing one cell means suddenly having exactly half capacity since the BMS continues to protect each cell pair. In such a case, replacing that bad module will restore the capacity. All Leafs that I have worked on, I have swapped the complete contents of a pack (48 modules). It is possible to find decent packs for around $3k. I typically get my packs either from buying a complete vehicle or just the pack from a dismantler BTW, you can check that all cells in a pack are equal in capacity by checking the cell voltages when the pack is fully charged and discharged. The Leaf typically manages to keep the cells together within approx 20mV so it is really easy to check using LeafSpy if there are any outliers at either high or low charge level, indicating greater loss of capacity in that cell. Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info http://www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. ________________________________ From: David Chapman [mailto:[email protected]] Sent: Friday, December 09, 2016 10:28 PM To: 63urban; Cor van de Water; Electric Vehicle Discussion List; Electric Vehicle Discussion List Subject: Fw: [EVDL] Anybody interested in 2011 Leaf with new pack for $8k? Cor, lately I have seen a few of these older Leafs with a similar problem IE diminished battery pack and am wondering if one could simply just "troubleshoot" the existing pack and replace the sub par modules? I have not worked on one yet so I have no idea if that is even feasible let alone advisable, I just have seen "good used" modules on Ebay for $100 or less and it got me to thinking about this tactic. On the other hand you mention that particular 2011 Leaf with a "new" battery pack, I am curious - are you replacing the 2 batteries in each module (essentially "rebuilding" the modules) or have you simply found a reasonably priced supplier of new OEM replacement modules? I am in AZ and I would possibly be interested in looking for a discounted Leaf in my area to "rehab". Like I said I have seen a couple similar deals where they appear to be going cheap as the current owners are afraid of what they might view as a rapidly diminishing pack. Would value your input on this. Regards Dach. "Do what you can, with what you have, where you are" - Theodore Roosevelt "We reached the old wolf in time to watch a fierce green fire dying in her eyes .... I was young then, and full of trigger-itch; I thought that because fewer wolves meant more deer, that no wolves would mean hunters' paradise. But after seeing the green fire die, I sensed that neither the wolf nor the mountain agreed with such a view." - Aldo Leopold On Friday, December 9, 2016 3:27 PM, 63urban via EV <[email protected]> wrote: Cor where are you located again? Sent from my Bell Samsung device over Canada's largest network. -------- Original message -------- From: Cor van de Water via EV <[email protected]> Date: 2016-12-09 4:48 PM (GMT-05:00) To: Electric Vehicle Discussion List <[email protected]> Subject: [EVDL] Anybody interested in 2011 Leaf with new pack for $8k? Two months ago I bought a 2011 with a new battery for $8800 so I am not waiting to buy another Leaf at this moment, but a local Leaf owner is trying to sell his 2011 Leaf SL (the most luxury version) for cheap since it lost 3 bars and he has changed job so he no longer needs it. I can install new modules in a Leaf battery so the total price comes to $8k (I should have waited with the other Leaf I guess but I did not know in advance that this would come around) so you would end up with a nice Blue 2011 Leaf, I believe it has 63k mi and no other blemish than a shallow scratch on the front bumper due to a shopping cart (did not even break the paint, just left an indent) and the best is that it will have its original range, some Leaf owners even report better than original range. Let me know - don't wait too long with expressing interest as I need to tell him if I put down a deposit to hold the vehicle, else he might sell it any day... Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info http://www.proxim.com <http://www.proxim.com/> This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. 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