The last two charges my Zoe on 100% is showing 56 rather than the normal 90 mile range. I called the service centre it is under warranty with and they couldn't tell me, they said 'they just do that'. I asked how but they didn't know, I asked how they know my battery is OK and they gave the same response - they just do that. Calling Renault direct didn't bear any fruit either. Probably on here people know better I'd imagine!