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A normal battery will lose 1% of it's charge daily, give or take. Hook it up to a car that has a parasitic draw, as they all do, and it will lose more. If you're allowing your car to sit for periods of time without use, you can expect it to have a partially discharged battery the next time you get in it. Your best bet is too keep the battery on a small trickle charged when it's not in use and check both the battery voltage and electrolyte level somewhat frequently.
If you run your battery down too far too many times, you'll kill it.
JR
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