Tried searching through some threads on this but I'm so mechanically inept that I can't put two & two together, so here goes:
Had a problem where after a 10 minute drive, I came to start the car again and it died completely before turning over. Got a jump start, and car ran OK for next 10 minute journey. Had the battery checked at Halfords and they advised it was about 75% and didn't need replacing, just needed a good charge. So, jumped it again and went for a 20 minute drive this time, that was fine. Came out later on to start up, dead again - jumped it again, kept it connected for much longer this time and managed to get home OK. Comes to this morning - I go to start the car, fires up first time. Bemused, I decided to go straight out for a 90 minute drive to (hopefully?) fully charge the battery.
Now, the funny thing is I have the car booked into JM next week to look at a potential issue with the aux belt tensioner (makes a half second squeak at start up, or pulling away when cold etc) and I've read that this kind of issue can cause additional problems for that alternator? Does it sound like the alternator is goosed? Or do I have an wiring gremlin that just hates Saturdays?