Hi Tim,
I wonder if the batteries you had in the past and the ones you currently are having problems with are the same as far as amps of capacity. If the old batteries where stronger (more capacity) than the new ones, then the new ones will most likely run down much sooner.
If the problem is a difference in life from when you were using the same battery last season compare to the life this season, then I would check out all of the previously mentioned issues.
Merv
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