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It could be a defective battery, but a normal battery will not crap out after only two years unless something is wrong.
It could be your voltage regulator, which controls how the battery is recharged, so if the regulator is bad, it doesn't recharge and will always run down.
It could also be a bad alternator, same idea, it recharges the battery and if it doesn't work, the battery runs down.
A decent and honest trouble-shooter should not have too hard a time finding which it is.
my edit: maybe "worst case" as far as finding it, is if you have a weird electrical short circuit causing this, since they could be hard to find.
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