Valdemar
Posts: 2664
Joined: Tue May 10, 2011 10:32 pm
Delivery Date: 09 Sep 2011
Location: Oak Park, CA

Re: Anybody with 2011 or 2012 interested in upgrade to new battery?

Fri Oct 28, 2016 7:24 pm

Definitely it was faulty modules, confirmed by LeafSpy and dealers. Lazy to find those threads, but you can if really interested. Rare cases, but real.
'11 SL, totaled
-1CB@33k/21mo, -2CB@53k/33mo, -3CB@68k/41mo, -4CB(41.5AHr)@79k/49mo, -5CB(38.85AHr)@87.5k/54mo
-0CB(66.14AHr)@87.5k/54mo (BBB), -1CB(53.92Ahr)@140k/29mo,
51.1AHr, SOH 80%, 150k miles

9kW Solar

User avatar
Coronado54
Posts: 14
Joined: Wed Sep 16, 2015 7:30 am
Leaf Number: 019904

Re: Anybody with 2011 or 2012 interested in upgrade to new battery?

Sat Oct 29, 2016 4:34 pm

I read through all the posts in this topic and want to add my thanks to Cor for his work. I've profited from his work on the Gen 1 Prius over the years so I'm happy to see him here in Leaf Land!
Ed

Cor
Posts: 161
Joined: Sun Jun 30, 2013 6:53 am
Delivery Date: 07 Jul 2015

Re: Anybody with 2011 or 2012 interested in upgrade to new battery?

Mon Oct 31, 2016 2:28 pm

Valdemar wrote:Definitely it was faulty modules, confirmed by LeafSpy and dealers. Lazy to find those threads, but you can if really interested. Rare cases, but real.
Hi Valdemar,
I don't doubt that it happens. In fact, I an easily see that if a module has one cell with a manufacturing defect or just a failure and it goes "open" so there suddenly is one spot in the series link that does not have a buddy-paired set of cells in parallel, but only a single cells,
then the range suddenly falls to half, the BMS will protect the remaining cell and only half the capacity of the pack is usable, so replacing that one faulty module can restore it to full capacity again. I am only wondering who is going to perform that work, I doubt that a mechanic will be allowed to do this so it must be a specially trained person from Nissan that will need to travel to the dealer or the battery needs to be freighted to him and back - always an expensive and slow proposition. Shipping new batteries to dealers is standard practice....
I'll see if I can find the posts about module swap, that might be interesting.

Cor
Posts: 161
Joined: Sun Jun 30, 2013 6:53 am
Delivery Date: 07 Jul 2015

Re: Anybody with 2011 or 2012 interested in upgrade to new battery?

Mon Oct 31, 2016 3:23 pm

I found one of the threads about module replacement and indeed, it seems like it is a single cell blowing in a module, causing massive loss of capacity and weird Voltage imbalance errors, leading to Turtle mode and other issues.
http://mynissanleaf.com/viewtopic.php?f=30&t=20106
Two certified techs from Nissan are required to work on replacing a module, so it took weeks to arrange for all the logistics and I doubt that this has any benefit over simply replacing a pack by Nissan. Leaf Spy can easily detect these failures and diagnose them from the displayed cell voltages - let alone from the DTC error reports.
NOTE that early (2011-2012 packs were bolted shut with a solid rubber gasket clamped between the two halves of the shell, so you can easily open and re-close it.
Since 2013 the shell is glued shut. I have serious doubt that anyone from Nissan will try to open such a shell, it is a major headache and leads always to damage to the shell. I have only glued one pack back shut and I will have to see how it holds up over time, it is on my private vehicle.
Was interesting to read the thread about the module replacement and the issues encountered.

I have started to put 2 full Leaf packs (96 modules total) into my EV truck together with 2 Leaf BMS units.
That will be an interesting experiment and I hope to get close to 100 miles range.
I want to modify a "CANary" to display the info from 2 BMS units on the 2 displays as well as give the over/under charge protections.
We'll see if we can figure out the interface to the truck for the BMS. The packs themselves are not a problem,
though I need to re-configure them so it is a lot of cutting of metal and slicing of orange bus bar and sense wiring protection plastic.
What I did learn was that I need to keep all cells from a pack together to allow the BMS to keep them together, so I will make two
independent strings of 48 modules (maintain the two original packs) which only get paralleled when charging and driving.

Cor
Posts: 161
Joined: Sun Jun 30, 2013 6:53 am
Delivery Date: 07 Jul 2015

Re: Anybody with 2011 or 2012 interested in upgrade to new battery?

Mon Nov 07, 2016 10:09 am

Cor wrote:BTW, in the near future I will have to buy another battery pack
That will probably be in December or Jan, as I am working on my EV truck now and also traveling later this month.
Anybody interested in regaining range, let me know.
I will probably try to get a 2015 battery so the battery swap will probably be about $3k, depending on the capacity of the new pack.

co2112
Posts: 53
Joined: Fri May 22, 2015 12:30 pm
Delivery Date: 02 Jun 2015
Leaf Number: 009322
Location: Sacramento, CA

Re: Anybody with 2011 or 2012 interested in upgrade to new battery?

Tue Nov 08, 2016 10:35 am

Cor wrote:
Cor wrote:BTW, in the near future I will have to buy another battery pack
That will probably be in December or Jan, as I am working on my EV truck now and also traveling later this month.
Anybody interested in regaining range, let me know.
I will probably try to get a 2015 battery so the battery swap will probably be about $3k, depending on the capacity of the new pack.

PM sent
2011 Black SL

2013 Rav4 EV - 2263

Cor
Posts: 161
Joined: Sun Jun 30, 2013 6:53 am
Delivery Date: 07 Jul 2015

Re: Anybody with 2011 or 2012 interested in upgrade to new battery?

Tue Nov 08, 2016 6:06 pm

co2112 wrote:
Cor wrote:That will probably be in December or Jan, as I am working on my EV truck now and also traveling later this month.
PM sent
Cool, I have put down a deposit on a 2015 battery that should be available end this month.
I don't know who are all buying those, but prices for these young batteries have gone up like crazy,
Apparently even nation-wide the cheapest you find a 2015 battery is $3k before tax.
Luckily I am quite good at haggling so I got a better offer than the nationwide lowest price,
but I was not expecting that the cost of the used battery would already be about $3k. Wow.
Apparently my offer of installing modules in your car for $3k is quite a good deal. ;-)
BTW, this battery should have done about 14k miles and I can tell you the actual capacity when it arrives (LeafSpy).

co2112
Posts: 53
Joined: Fri May 22, 2015 12:30 pm
Delivery Date: 02 Jun 2015
Leaf Number: 009322
Location: Sacramento, CA

Re: Anybody with 2011 or 2012 interested in upgrade to new battery?

Mon Nov 14, 2016 4:39 pm

Ended up trading in the Leaf for the Rav4 EV. Thanks for offering your help but seeing 44 on the GOM and getting LBW by the time I made it home made it nearly impossible to commute. With the degradation on the RAV 4 being minimal I opted to stay electric without having to sacrifice the range. Your deal is a good one and would have been much cheaper than the RAV4 but now I know the battery will last much longer than the Leaf and give me the distance I need. 115 miles on Rav4 GOM from 44 on Leaf.
2011 Black SL

2013 Rav4 EV - 2263

Cor
Posts: 161
Joined: Sun Jun 30, 2013 6:53 am
Delivery Date: 07 Jul 2015

Re: Anybody with 2011 or 2012 interested in upgrade to new battery?

Mon Nov 14, 2016 6:35 pm

co2112 wrote:Ended up trading in the Leaf for the Rav4 EV.
OK, Enjoy the RAV4 EV!
Thanks for letting me know,
this means that in December I will have a low mileage 2015 battery available
to install in someone else's Leaf with deteriorated cells.

Cor
Posts: 161
Joined: Sun Jun 30, 2013 6:53 am
Delivery Date: 07 Jul 2015

Re: Anybody with 2011 or 2012 interested in upgrade to new battery?

Fri Dec 09, 2016 2:58 pm

Cor wrote:this means that in December I will have a low mileage 2015 battery available
to install in someone else's Leaf with deteriorated cells.
OK, it looks like the low mileage 2015 battery that I will get next week will be installed in a Leaf in Los Angeles and the take-out modules will also stay there, so I only need to load my Prius with tools and battery modules on the way down from Silicon Valley to LA, I will come back up empty. Good. I may try to get another low mileage battery soon as there still is a local Leaf owner who wants to sell his 2011 SL for cheap as it has lost 3 bars and if I find someone interested, I can help them to regain the original range (the current owner changed job, so he does not need the Leaf any more)

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