Battery draining quickly

So as you, I didn't drive xmas day, went to go out Boxing day and the battery was dead. Got a jump start took it for a 20 mile drive on a dual carriage way (70 mph - approx 2500~3000 rpm) gave the battery a good charge. Next day again it struggles to start and gives the impression it was about to give up the ghost before it eventually fired up.



Day after same thing.



What could be draining the battery this much?



The battery is a few months old, and is heavy duty. The indicator on the battery suggests it's in good health.

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