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Yes, all vehicles in the last 30 years or so draw somewhere between 15 and 35 mA or so of current while off, sometimes more, as backup power to the computer. Remote starters and alarms draw more. A month is about 700 hours, so you can easily draw 35 amp-hours of capacity out of it. While that doesn't sound like much compared to a new battery rating, it can be enough so that the voltage drops quite a bit while cranking.

Also, plowing at low speeds generally doesn't rev the engine up to highway speeds for any length of time, and the current demand in moving a blade around can be high.

So, yes, probably it should be run more often and driven about an hour each time. A load test can confirm if the battery is still good.
 
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