I have used this several times with confidence. It started a diesel showing 9 amps easily. It saved my butt camping; we were deep in the bush. The batteries wouldn’t hold a charge. We still hunted and used this to start the truck for several days. Can’t say enough about this product. I also bought the GB50 for the wife’s car. According to the manufacturer, it loses less than 1% a month and it should be charge once a year (I check every 6 months) and you should be good to go. Buy once, cry once.
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