I suspect you're having issues getting enough current through the alligator clip interface. They really are garbage. Of course you want to get a surface charge on the victim battery, that's why when we do "traditional" jump starts we idle the donor car with the cables hooked up for a few minutes. A 14.5 V source > a 12.3 V one for this.
There has to be an actual "professional" answer for this, which sucks to find, because the market is saturated with plastic garbage with the aforementioned tiny batteries inside. IMO they should have a "7 cell" battery with special charger and nominal 14V rating.
That Clore with 425 cranking amps probably has 3xx cold cranking amps, so it's the same as a battery for a honda fit. I knew a guy who worked at an auto auction; their jump rig was a hand cart with two full size batteries wired in parallel with beefy cables. IMO you should come up with a group 24 (or whatever) battery with built in handle, some 6 gauge jumper cables, and universal terminals. Cut back to around three feet of cable, fit up the terminals, and store the clips connected to a piece of leather or whatever so they don't short. Get cables with insulated alligator clips, quality ones, that fit terminals nicely and have good spring to them.
There has to be an actual "professional" answer for this, which sucks to find, because the market is saturated with plastic garbage with the aforementioned tiny batteries inside. IMO they should have a "7 cell" battery with special charger and nominal 14V rating.
That Clore with 425 cranking amps probably has 3xx cold cranking amps, so it's the same as a battery for a honda fit. I knew a guy who worked at an auto auction; their jump rig was a hand cart with two full size batteries wired in parallel with beefy cables. IMO you should come up with a group 24 (or whatever) battery with built in handle, some 6 gauge jumper cables, and universal terminals. Cut back to around three feet of cable, fit up the terminals, and store the clips connected to a piece of leather or whatever so they don't short. Get cables with insulated alligator clips, quality ones, that fit terminals nicely and have good spring to them.