ElectricEddy
Posts: 501
Joined: Tue Feb 25, 2014 1:42 pm
Delivery Date: 31 Oct 2016
Leaf Number: 313506
Location: Nanaimo, B.C.

Re: Timecapsule 2015, dodgy battery troubleshooting

Wed Nov 07, 2018 4:02 pm

I don't suppose it ever threw any DTC codes, what we might look for if running into a similar situation. Check with Leaf spy in the service menu-enable service screen/ Read DTCs.
Possible cell over discharge P3375-P338C or ASIC open P33E6 for example.
Please report back if any found.
Pearl White Sl
mfd date 09/16

Dala
Posts: 101
Joined: Sun Oct 28, 2018 11:24 am
Delivery Date: 01 Jan 2015
Leaf Number: 316851

Re: Timecapsule 2015, dodgy battery troubleshooting

Thu Nov 08, 2018 4:42 am

ElectricEddy wrote:I don't suppose it ever threw any DTC codes, what we might look for if running into a similar situation. Check with Leaf spy in the service menu-enable service screen/ Read DTCs.
Possible cell over discharge P3375-P338C or ASIC open P33E6 for example.
Please report back if any found.
Yeah I'm kicking myself for not checking the actual codes it threw while in limp mode. But if they get the chance to come back before I get the new cell, I'll def post here.

Now done 50km since last charge, car still says it can do 120km (I know it wont) but let's see :) Feels good to be able to use it :)

ElectricEddy
Posts: 501
Joined: Tue Feb 25, 2014 1:42 pm
Delivery Date: 31 Oct 2016
Leaf Number: 313506
Location: Nanaimo, B.C.

Re: Timecapsule 2015, dodgy battery troubleshooting

Thu Nov 08, 2018 3:20 pm

Dala wrote:
ElectricEddy wrote:I don't suppose it ever threw any DTC codes, what we might look for if running into a similar situation. Check with Leaf spy in the service menu-enable service screen/ Read DTCs.
Possible cell over discharge P3375-P338C or ASIC open P33E6 for example.
Please report back if any found.
Yeah I'm kicking myself for not checking the actual codes it threw while in limp mode. But if they get the chance to come back before I get the new cell, I'll def post here.

Now done 50km since last charge, car still says it can do 120km (I know it wont) but let's see :) Feels good to be able to use it :)
They should still be there unless you cleared them with Leafspy.
My question is if Nissan is hesitant on performing battery pack warranty work ( under "normal circumstances") unless it throws a DTC code, than there could be a lot of Leafs out there with weak cells causing ltd range or sudden turtle.
Pearl White Sl
mfd date 09/16

kahi
Posts: 1
Joined: Fri Aug 10, 2018 2:52 pm
Delivery Date: 07 Aug 2018

Re: Timecapsule 2015, dodgy battery troubleshooting

Sun Nov 18, 2018 2:23 am

@Dala did you change the cell yet?

Dala
Posts: 101
Joined: Sun Oct 28, 2018 11:24 am
Delivery Date: 01 Jan 2015
Leaf Number: 316851

Re: Timecapsule 2015, dodgy battery troubleshooting

Sun Nov 18, 2018 1:23 pm

kahi wrote:@Dala did you change the cell yet?
I did not yet, I have ordered two, but in the meantime I am testing out bottom balancing it properly, this will also aid in the future when I swap the cell.

So I got in contact with EVs Enhaced, and they gave me some pointers in how to better balance manually. Here are the steps I'm gonna do

1) Discharge the pack to a lowish point - the two cells will limit how far you can discharge of course
2) Remove the pack again and re-open it
3) Charge the two cells to significantly higher voltage than the rest of the cells in the pack
4) Temporarily, reinstall the pack into the car and continue to discharge (lights/heater/etc on) until all the cells in the pack (except the two higher ones) are in the 3.0-3.3V range. This time the two cells wont be limiting your ability to discharge the pack
5) Remove the pack and this time discharge the two cells to match the voltage of the rest of the cells - so they are all bottom-end balanced. Leave the cells to settle for a day after discharging to re-check the voltage and discharge further if required.
6) Reinstall the back and fully charge it - if the two cells hit 4.12V while charging before the rest of the other cells then they are certainly lower capacity so replacing them would increase range to some extent. If other cells in the pack hit 4.12V before the two cells, then this replacement module has equal or better capacity compared to the rest in the pack - replacing it would give you no benefit.

Here is a screenshot from point 3
Image

Here is a screenshot from completed point 4
Image

Still waiting a day for it to settle, then I'm gonna rebalance at close to 0 SOC and seal it back up. Watch this space.

jblomstein
Posts: 10
Joined: Sun Nov 18, 2018 6:40 pm
Delivery Date: 19 Nov 2014

Re: Timecapsule 2015, dodgy battery troubleshooting

Sun Nov 18, 2018 6:47 pm

the amount of work you did for this is crazy! how could nissan sell a car with a battery this dodgy?

Lothsahn
Posts: 488
Joined: Thu Apr 05, 2018 4:35 pm
Delivery Date: 04 Jan 2018
Leaf Number: 007797

Re: Timecapsule 2015, dodgy battery troubleshooting

Sun Nov 18, 2018 8:50 pm

The reality is all manufactured goods have defects and stuff happens. These failures are quite rare and covered by warranty, except in rare circumstances like Dala's.

I understand you're frustrated about your car, but stuff happens. We're here to help you if we can, if you provide the info requested in your thread.
2011 Silver SV, purchased 2018, lives in Missouri (previously in CA)
LeafSpy Pro + BAFX Products OBDII dongle
Battery swap 2019/04/24 (87% SOH, 12 bar)

Dala
Posts: 101
Joined: Sun Oct 28, 2018 11:24 am
Delivery Date: 01 Jan 2015
Leaf Number: 316851

Re: Timecapsule 2015, dodgy battery troubleshooting

Sun Nov 18, 2018 11:05 pm

Some additional information
- The cell was replaced by the previous owner. He did not have any concept of balancing. Nissan is not at blame with this vehicle
- Never balance at middle SOC. Always do it at extremes, like fully charged or fully discharged. There is too much variance in the middle. Bottom balancing is best for EVs, to get maximum range.
- After my initial shitty middle balancing, the car made 85km possible. Let's see how much a proper balancing helps!

Dala
Posts: 101
Joined: Sun Oct 28, 2018 11:24 am
Delivery Date: 01 Jan 2015
Leaf Number: 316851

Re: Timecapsule 2015, dodgy battery troubleshooting

Wed Nov 21, 2018 9:49 am

So I finished the bottom balancing. Here are the results

I was hoping to get a peek of the model number for the shitty replaced cell, but unfortunately it is below the visible sheet metal.
Image

Here is the car, fully charged. Note that it only goes to 83% SOC, limited by the shitty degraded cell that hits 4.1V before the rest.
Image

After driving it for 15km.
Image

After driving it for 30km
Image

Noticed that the fully charged GOM now says 140km instead of 180km. The bars are also lost quicker up top now (expected!) but should now be a bit more stable at lower SOC.

This concludes manual balancing. Now the next step is to actually replace the module. The bottom balancing will probably squeeze out a few more km's, might even be able to hit >100km now, but cell replacement is inevitable.

goldbrick
Posts: 613
Joined: Tue Aug 01, 2017 3:33 pm
Delivery Date: 01 Aug 2017
Leaf Number: 311806
Location: Boulder, CO

Re: Timecapsule 2015, dodgy battery troubleshooting

Thu Nov 22, 2018 12:32 pm

This thread has taught me a lot. Thanks for sharing and good luck with the new module.

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