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Northeast Missouri | All I know is, the power rating of the charger has a lot to do with battery life. My 1-joule chargers work for most of 2 weeks on a big car battery (pretty variable, depending on battery size and quality, weed load, etc.) But on a 2-joule charger the same battery literally only lasts half as long before needing a charge...so I always run a solar panel with the 2-joule charger. | |
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