Having just ploughed through the details of my second battery lease, I discovered something rather interesting. I noticed in 'executed copy' of the lease agreement (this is for the battery only, remember) that the sections stating the value of the battery, and that in subsequent years the value falls by 10% per annum. AND the maximum contracted mileage you are allowed.
In both cases, this was blank! Just to make sure, I had a look at my soon-to-be-terminated Twizy lease and discovered it was the same! Can you check yours and see what your actual agreed commitment is?
Assuming I am not alone, then the debate on the write-off value of the battery in case of total loss may be academic, as they have contractually agreed there is none! Since they cannot retrospectively alter it, either we're being royally wound up, or they are being grossly incompetent!