So... I've had a squealing belt intermittently for a few months now, happens on starting the car and i believe from reading up that this is the AC belt needing tightening? However there's been a couple of occasions after driving about where the car has been laboured when starting again. It feels like a battery issue or maybe alternator, and I've been meaning to get it looked at. Last night, I left the car running on the drive for about 5 mins while I fixed a meter door on the house, took the keys out, let myself in the house to get changed, and went to go out again when the car refused to start at all. Like the battery was completely dead. However 3 hours later, I thought I'd try and start the car again and it fired up first time, albeit with the squealing belt again. The battery voltage is normal on the gauge.
Can anyone tell me what's wrong and how my car is managing, I guess, to almost 'recharge' itself when the engine isn't even running?