Right off the bat, all lead-acid batteries self-discharge just sitting around even if there is NO drain on them. Much depends on how much antimnony is inside them, and how hot they get. ?The hotter the weather, the faster they discharge. But, the hotter you engine is, the less likely you're going to notice.
Here are typical discharge rates:
Flooded Lead-acid (antimony) - 8%-40% per month - faster discharge when hot
AGM and GEL (calcium) - 2-10% per month
Nickel Metal Hydride - 30% per month
Ni-Cad - 15–20% per month
Lithium - 2–3% discharge per month
Diesel tractors aren't an issue, nor are cars and trucks made mid-90s and back. The newer cars and trucks draw current while parked and all will drain the batteries to some degree. Usually 50-80 milliamps, but some loaded with accessories drain up to 400 milliamps. Some new Fords draw 1000 milliamps for 15-20 minutes after every shutdown, then cut own to a lower drain. It's just a matter of how many drains they have and how big the batteries are.
A typical car or truck battery will have a 50-80 amp-hour rating.
A 50 AH battery can approx. handle this much drain NOT accounting for the natural discharge:
1 amp drain for one day 400 milliamps drain for 2-3 days 100 milliamps for 10 days 50 milliamps for 20 days 10 milliamps for 3 1/2 months
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