Technically yes it is not a big job to extract the battery from a Twizy and re-install. It does weigh quite a bit (around 100kg), so sending it over would have to go through a freight carrier. The difficulty will be to get Renault RCI to agree to transfer the contract, it might be tricky as this would involve two distinct countries (I’m in France). When the battery crosses the border with the car to a new owner, then it does work, because that is exactly what I’ve been through (I bought the Twizy in the UK and imported it to France), and RCi has a procedure for that (simple in theory, but was a bit of apin in reality due to their notorious incompetence, they kept pestering the original owner for the rental fees even after I had taken over the contract and was paying the fees!).
I want to make my own battery, I’m very interested in the technical challenge, and I find the monthly charge too high. The battery is the same age as the car, from 2012. It has 96% of its original capacity (“State of Health” parameter). My contract if ending on 6th July 2020.
I’ll contact RCI here to ask them what they are willing to do (sell the battery as second hand ex-rental, transfer the battery and rental contract to a different Twizy owner). If they are not interested in any of these reasonable solutions, I’ll be delivering the battery to the nearest Renault dealership and will not renew my contract with them.
Will keep you posted!