I have just (5 weeks ago) bought an MG5 EV SW, my first electric vehicle. I have charged it mainly with the 3 pin 'residential' charger, plus a couple of times at supermarket/garage. My issue relates to sudden changes in miles left on the battery (range) in relation % charge left. I have had three occasions when the miles have suddenly, literally in a second, dropped (e.g. 144 to 129) with no change to % charge left in battery according to the display. Not a major problem, perhaps, until suddenly had to make a round trip of 38 miles in the evening when battery was at 25% with 50 mile range shown on display. After about 15 miles of trip, the range dropped suddenly from 37 miles to 22 miles and then reaching my stop and turn round point was on 8% and range only16 miles - so there was not enough to get home. I found a 7kw charge point at a garage and charged for an hour up to 21%, fortunately it was not snowing when I walked around, but got home with only 6% and 12 miles range left, after warnings about 'aggressive driving' and a speed limited to 50 - I had done 55 max on way home! I have contacted the MG garage where I bought car and they say it sounds like a battery problem, but they are not certain as mine is only the second EV they have sold! However they say will check it, but because of COVID can only do this in 10 days time. However, is this normal?