Speaking of Battery power, was putting new brakes on one of the cars a few weeks back so had it up on the hoist overnight, ignition wasn’t on but had left the key in it, so maybe I left it accessory mode and dead flat battery next day, pulled out the Lithium jumpstarter which Slackly I hadn’t looked at for six months ( instructions say recharge it every month) it was still showing 100% and started the car instantly, after starting the car it still showed 100% but I plugged it in anyway and the light flashed for a couple of seconds and turned solid indicating fully charged, pretty bloody impressive technology