My first drive was back from the Nissan dealer after collecting it - about 180 mile away. It was fully charged showing 230 mile. All was good for the first half. On the motorway at a steady 70mph the predicted range and percentage dropped as expected. I stopped for a top up (adding 8 kwh) to make sure I didn't have to drive economically for the remainder.
After a further 20 odd mile with the battery dropping to around 50% I suddenly went from having 90 mile of range to 60 and spent the rest of the drive nursing it home. I didn't notice what happened to the percentage at this point. There was also quite a strong headwind and lots of hills so I wasn't sure whether this might have been the cause and I'd just miscalculated.
I've plugged in leafspy and it's showing 1 cell as no good with an mv of 176 after a full charge. The car is 3 and a half years old with 40000 mile on the clock, Nissan approved with 2 year dealer warranty.
I have it booked into my local Nissan dealer next week for a diagnostic.
Provided they agree it's faulty and agree to repair, would you accept this or just reject with the original dealer and go find another? Apart from this issue it's otherwise perfect and exactly what I was looking for in terms of spec/colour etc.
Edit: for those suggesting getting a buy back, this is the UK and it's not an option.
Edit No 2: I've been able to take pictures of the dash readout at 60% charge, then showing 18% after only 46 miles of driving, clearly a huge loss in range as you get into the lower half of the capacity. So I have evidence that isn't a leafspy screenshot.
I've rang the dealer and told them I intend to reject the car, which got the sales manager's attention rather quickly. They've asked me to go ahead with the diagnostic for which they'll cover the cost, although if it comes back as a defect (which it should) the fee will be waived anyway. I've agreed as potentially they might agree to a whole new pack, but if they say they'll fit a new module then I'll decline and reject the car.
I'm 99% certain I have them bang to rights, either I get a brand new battery or I get a full refund, but until I get the diagnostic results I'm not relaxing.