Battery 17% sudden drop while driving

[Chad E. Mo]

The LeafSpy Pro app and the suggested OBD dongle are essential for DIY Leaf troubleshooting, and cost less than a decent socket wrench.

With the release of version 0.39.97 LeafSpy Pro now supports two Bluetooth 4.x LE approved adapters. The recommended one is the LELink available from Amazon. Bluetooth 4.x LE has the advantage of not needing to be paired and lower power from both the Android device and the Leaf. The LELink is highly recommended and also works with the iOS version of LeafSpy Pro.

https://play.google.com/store/apps/details?id=com.Turbo3.Leaf_Spy_Pro

 

[Stanton]

Does anyone have a specific OBDII dongle that has worked with the LEAF and LeafSpy? There are so many super cheap to quite expensive; some require their app to be downloaded, etc.

Here's a good tutorial on choosing an OBDII dongle for LeafSpy (Choosing OBDII adapter – Car Scanner ELM OBD2).
I use a VGate iCar dongle I bought off Amazon.

 

[MikeDenn]

Sorry to be thick but where is the socket located to plug the OBDII dongle in on a 2020 leaf?

 

[user546379]

UPDATE: The problem has gotten worse since my original post. The GOM will rapidly drop by more than 40 percentage points over the distance of just 4 to 5 miles. So it seems unlikely that is is related to the software update that was done. There was a recall just announced that applies to my car, as described in this newer thread:
https://mynissanleaf.com/threads/recall-r24b2-battery-state-of-charge.36460/page-2#post-651050

 

[nlspace]

UPDATE: The problem has gotten worse since my original post.

Did you get an OBDLInk LX dongle and use the LaefSpy app to monitor what is happening while you are driving up that big hill at 60-65 mph?

The cells will sag under high load--that's just how batteries work. It would be a problem and an issue if there were one or more modules that were way out of family (excessive sag) with all the rest, and if it got dragged low enough it would trigger the Turtle mode.

When the hill is crested the load is lessened, and the cells have a chance to recover (the SOC% rebound)--that's just how batteries work.

If you want to know if you have a problem then you need to monitor the cell and pack voltage along with the power and current draw when all this mess is happening.

What is the grade of the hill and the length of the drive up? Try running it at 50 mph and at 70 mph to see some different results for comparison.

It might be related to a software issue, but maybe LS can help you to rule out any hardware concerns first.

Good luck and hope you can get to the bottom of this.

 

[Jerther]

Your problem should be covered by the traction battery warranty. Has your dealer agreed to investigate? If not, find another one. In any case, they have to replicate your problem first. Videos and pictures are not enough, but could help them replicate the problem. Also, it should be more severe and obvious in colder weather. I have written quite a bit about the process as I went through this two times

https://mynissanleaf.com/threads/rapid-charge-loss.27994/page-3#post-635081
https://mynissanleaf.com/threads/2018-getting-a-new-battery-under-warranty-now-what.34795/
https://mynissanleaf.com/threads/new-40kwh-battery-on-2018-sl-sudden-charge-drop-at-low-load.34917/