The battery warranty on the MG ZS EV is seven years/80,000 miles. After this time, MG says the battery must have 70 per cent of its original capacity. Based on older electric vehicles, we're finding that batteries aren't degrading as quickly as you might expect. They should be good for at least 10 years, if not more. It's rare for them to suddenly fail, either - they simply lose capacity over time. This suggests that buying an MG ZS EV could be a sound purchase. The only thing to consider is if you have any desire to have 'the latest thing' - electric vehicles are developing rapidly and you might find, after three years, you want to upgrade to the latest model.