MrNicG wrote:I've been trying to find out what is causing my battery to degrade so fast.
Where are you located? What is the local climate like? What kind of driving do you do? What kind of charging?
LeafSpy reads the Battery Management System (BMS). The BMS estimates of capacity vary for reasons that have nothing to do with capacity. Short term trends are not meaningful.
By driving and charging in a specific way I was able to raise my LeafSpy SOH numbers by more than 12% in a few weeks. I've been able to lower the numbers by about 3% by driving and charging in a completely different way.
There are many different explanations what what you are seeing. The first is that you live in a very hot place and the battery is losing capacity quickly. The second is that you are doing awful things to the battery. The third is that your driving is different than the last owner's, and the BMS estimates are changing without any real change in battery capacity. And there are probably more.
There also seems to be a seasonal cycle in reported SOH. Drops in the summer, and recovers some but not all of that in the fall/winter. Also not a real change in battery capacity, as capacity is lower at cooler temperatures.