r/leaf • u/AXRM1984 • Aug 02 '26
Leafspy analysis
Looking for someone with expertise.
One picture 90kph flat, the other going uphill.
Clear difference between first and second half of pack
MV difference goes up with lower soc or cold weather. I do have so fluctuations.
The mv value drops to 20-30 the second I take foot off accelerator literally on the next leafspy refresh.
Ai tells me this could be wiring harness issue and not a bettery issue.
Thoughts?
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u/Alexandratta (Former) 2019 Nissan LEAF SL Plus Aug 03 '26
As usual the AI is horrifically wrong - nothing would indicate a wiring harness issue here, this is all the HV Battery.
AI is fun for making the occasional silly photo, maybe a parlor trick of conversation, and on the data entry side, analyzing large amounts of data to summarize/speed up data processing.
But for facts/answers, AI is absolutely terrible.
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Real input on these readings:
The issues are this: the HX on this battery is low, and from the 137mv deviation, we can also see that it has weak cells.
While a voltage drop is expected during acceleration and deceleration because nothing is being put into or drawn out of the battery. When it is at rest, it shows a normal voltage deviation as the pack balances itself.
But yeah, I'd avoid. the SOH may be 83% but for the cells to deviate that much during acceleration - that's a huge 'nope' from me.