When I had my own workshop I had all these sales reps showing me these jump starters that were the best thing since sliced bread.
So I bought a few.
I killed every single one of them.
The better one jump started a 70 series Land Cruiser,
once.
We killed another jump starting my EF.
We also killed another two SUPPOSEDLY 2000A jump starters used by a local mine to jump start their earth moving equipment.
We made an example out of the sales rep, we had a KW prime mover sitting in the yard with flat batteries, 2000A will turn it over and start it no worries.
Hook up your jump start pack to it, he does.
I turn the key into start position.
The engine doesn't even get a full turn and the jump start pack flashes with an error code saying short circuit.
It killed the pack.
Sales rep goes that one wasn't fully charged.
OK no worries bring another next visit.
Next time he brings another new pack and made sure it was fully charged.
I make him hook it up to the KW in the yard again.
Engine doesn't even make a complete turn.
Jump start pack throws error code and its toasted.
He became the running joke at the office afterwards when I went into their branch they were asking me if I was interested in their jump start packs
This is what we used as our jump start pack:
Two old N120MF batteries, they're only 900 CCA each when they are new, they were taken out of trucks to be replaced.
Funnily enough it started that KW prime mover no issues?
If you want something decent, get yourself a set of the LV8152 leads from JAS Oceania:
http://www.jasoceania.com.au/ts14900...150-LV8152.pdf
They've got 70mm2 cable and heavy duty clamps, they're only about $200 a set and its cheaper than you can make them for with half the size cable.
Then get yourself a Deka Intimidator 9A34 or Optima D34 AGM battery and a smart charger.
Presto, instant jump start pack that will start a tractor.
Or if you want something cheaper change the AGM battery for a Century 67 EF MF, just don't leave it on the charger as its a lead acid battery.