I've also got a 2000 amp Noco HD booster, has worked at starting my isuzu bighorn when i had low battery, slow cranking, got 5-6 starts before need a charge, so i am pretty happy,
I use a 3000 amp model starting earthmoving equipment, enough to power electronics for the air starters.
we use lead acid 12/24 volt boosters at work.
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