1000 amp rating is meaningless and misleading. Jump starter pack rated a 1000 "peak" amps is often really rated at around 250 cold-cranking-amps. I suggest you only buy something that gives real specs - like the size of the battery and power in CA or CCA. Likely something rated over 2000 "peak" amps. E.g., a JNC660 is rated 1700 amps and its real rating is 425 cranking amps which is as low as you want to go.
I have a Duracell Powerepack 600 with no misleading hyped "peak" ratings. Has a 27 amp-hour battery and I have tested it at 500 cranking amps. I suppose with the more usual marketing BS, it would be called a "4000 amp" pack.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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