i'm not going to speculate on the exact cause of the problem, however regarding a new battery, i recently (6 months ago) bought a new one for my disco, a fullriver AGM 825CCA (@0deg F) and 1000CA (@32deg F), honestly it has improved my starting a heap,
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in that it can sustain more than a few tries to get it started,
from your recent posts it seems that your battery is going flat pretty quickly trying to do the same
mine wasn't cheap (approx $340) and i probably took a bath on the price, but maybe do some shopping around on something rated a fair way above the bare minimum required, i'm glad i did