First, it's not a battery charger as I thought. As far as jump starting, it's worked for me w/ medium to light duty batteries as long as the battery isn't completely dead & it isn't really cold, like 20-25 deg F. How often do you need recharge it? Hard to tell; it would've been nice to have an indicator for that. Since it doesn't I just use my judgement, not as often as manufacturer instructs - "after each use and/or every 4 months." I have gotten my money's worth as I've used it not only to jump start a few dead batteries, but extensively to inflate tires: bikes, trailers, yard wagons, & cars. For these reasons I can recommend it if consideration is given to the above negative points.
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