It seems to be the new killer topic, everywhere you look the non EVrs are going on about how the batteries will be dead in (2,3,4,5 insert speculation number). I keep an extra sharp eye on my battery as it does much more than average mileage and it gets treated hard with constant rapid chargers (Often multiple times a day). My car came with a 6 year 100k mile 70% Capacity Battery warranty. (First let me say I will breach that 100k miles somewhere between 2 and 3 years), so its not much use really but then I dont think the manufacturers would have offered that if they expected even 5% of vehicles to need to use it (Not financially viable) SO when I purchased my car I decided to write it down over 4 years (140 to 160k miles) Will be the first car in decade I have planned to keep more than a year, I normally buy from a Car Supermarket a 6 month old car, lob another 40k miles on it over a year and sell or trade for a £4k to £5k loss over the time/mileage. This time I decided to do it different and bought the Zoe with the plan to keep it for the 4 years (Or until it collapsed if a shorter time) With my Previous i3 there was no way to measure battery health and BMW who could check would never divulge, but being honest in the 40k miles I added it didnt seem to change anymore than you would expect from normal driving variations. Anyway onto the Zoe, this is handy as it can be told to show the true battery state of Health very easily. So I decided to monitor it roughly every 5k Miles (About the same time it gets a wash and hoover) Its been off the road a bit (4 weeks total) due to waiting for some parts, so the mileage is a bit lower than anticipated at the moment. NEDC Range for the car is 250 Miles that is total hogswash Renault Say Real World is 186 Miles that is about spot on. So as I need 140 miles each way to work I figured I would be safe even with a 20% Degradation down to 80% over time. 186 (20% = 37 Miles) 186-37 = 149 Updated Figures are now (Bearing in Mine people report anywhere from 101 to 103% on delivery but all say it drops to 100% within a few 1000 miles) 20000 Mile Update. Wow that was a fast 2500 miles this time. 12th Nov 2017 0 Miles 101% 14th Jan 2018 7250 Miles 100% 5th Mar 2018 10005 Miles 100% 25th Mar 2018 13520 Miles 99% 24th Apr 2018 15003 Miles 99% 12th May 2018 17502 Miles 98% 27th May 2018 20011 Miles 98% (FIGURES UPDATED 27th MAY 18) So a 2% total drop but only 1% from nominal in over 13k miles. If this stays linear I would be looking at only about 10% to 12% degradation over the life of the car which would be fantastic If you compare this to say a small 1.3l Petrol or Diesel pushed to the same miles it would be at EndOfLife at or before these miles easily and looking for an expensive engine change, whereas the EV should still be only 10 to 12% Below optimum Will be interesting going forward to see how the degradation changes, will update the thread as I get the figures in.