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10 minutes of head unit shouldn't drain the battery completely, it might have been low already.
If it is that power hungry and it's drawing power while the leads are on, then it's likely it won't jump.
If you've got time and want to go through this methodically, disconnect the head unit then try jumping it again to either rule out the head unit or identify it as the problem.
If you remove the head unit and it still won't jump then plug it into a battery conditioner to check the health status of the battery.
NurseHolliday
owl
An appeal to the more mechanically minded amongst you. I bought a mk6 golf a few months ago, been a dream since, not skipped a beat. Is due in for a service to pick up some bits I knew about when buying before some long trips coming up and MOT in Dec. I finally got around this weekend to replacing a wing mirror which had been battered about and fitting an after market android head unit (aliexpress). All seemed to go pretty well, but in hindsight I guess I may have had the head unit on for ~10 minutes without the engine being on and when I went to start the car it wasn't even close to turning over and the dash was list up with warning lights. So, assume I drained the battery (looking into it, seems lots of chat about these head units being problematic in this regard, recommendation being you need to go into settings and ensure it only ever turns on when engine on and auto-turns-off when engine off) but a mate came round to give me a jump, and despite 20 minutes of charge, nothing doing there. My questions are basically a) what should I do here? Use roadside breakdown cover to come and have a look or find local garage who offer some sort of outcall diagnosis/battery charge? b) my concern is that something I messed about with (wiring the wing mirror or the head unit) has gone wrong and emptied the battery which I will somehow need to get diagnosed, does this sound likely? And if so, is this something a general mechanic would take on or would I need a specialist electronics/audio guy?
Cheers