A couple of weeks ago we started our 3rd consecutive Leaf lease on a 2017 SV, our first 30 kWh model.
The next day we took it to the mountains for a spin, and were dismayed to see the %SOC drop much faster than expected. Overall range performance was a good 15%-20% below expectations for the season/driving/etc., expectations I'm very familiar with from nearly 5 years of Leaf driving.
After confirming the findings a couple more times - accelerated %SOC drop seen starting around 65-70% till around 25-30% - I contacted the sales person (a very known and liked person in Leaf circles), and right now I'm sitting at the dealership waiting for service.
They just confirmed *one* bad module out of 48, and are chatting with Nissan about whether to replace the module or the entire pack.
My main question is: how likely it is that only one bad module will be responsible for 15-20% range loss? If not very likely, I will need to push back if they try a single-module fix, and demand either a full-pack replacement or a lease swap.
Please respond quickly, but only if knowledgeable about the matter. Links to authoritative info also gratefully accepted.