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Sorry to hear that you're dealing with jerks. This is at least the third thread that's been started on here about dead batteries, so obviously there's a problem with something. (I'm positive that YOUR aftermarket reverse lights aren't running my batteries dead) But at least you've got yourself covered now in the event of future issue.
Im guessing that should help but do we know the reason for the premature battery failure? Is it bad batteries? Under powered alternators? Under sized batteries?