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Which warning light comes up ? Is it the battery light.
How old is the battery, it is possible that the battery could have a bad cell.
I think the best thing you could do is get a battery load test done on the car to see if the battery is charging correctly. This would then help pinpoint the problem no doubt.
Also is the alternator belt slipping do you think, its could be slipping but not making a screeching noise I suppose. Inspection of the belt to see if its worn down might be an idea too while your looking over the car.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo