Oddly enough, after a jump start the battery seems to be holding a charge and the problem has gone away. It's like something was left on to cause the battery to go flat. It seems to me in a modern EV car it's impossible to leave something on, it's all taken care of for you. I'm beginning to suspect a random software issue, where something is left on on your behalf. This car seems to have numerous random software issues with the infotainment system, so anything could happen. I now carry a 12V portable LiFePO4 jump start pack, just in case. I'm a self help sort of person, roadside assist is not a solution. I now carry a hand tyre pump as the air compressor burned out on its first use. Lovely car to drive, very good economy, but somewhat frustrating with these "learning" issues.