Looking for a jump pack

My 22 Rav4 hybrid needs a jump ground on the passenger side so I simply include three feet of #10 stranded with one small alligator clip attached and store it in the Noco lithium jump start case.

 

Anytime I hear somebody say"better safe than sorry" a picture of buffoon in the emergency room with a non-emergency complaint and no final diagnosis waving their finger making a stupid face

 

So you’d spend the extra $60, just replace the battery? That’s the simple repair.

I’ve the battery out, load tested it, it failed. It’s a decade old.

 

Sparks?

 

It doesn’t help, that new, ultra compact jump packs come with cables about a foot long at most.

Not connecting to neg post is widely advocated, and widely ignored.

 

@HamiltonPrius , I bought a jump pack a little while ago, but never thought how I'd hook it up.
Those leads really are short.
There are some grounds in the vicinity of the "exclusive jump starting terminal".
A couple seem to be on the inverter (?). Seem more robusto than the body grounds also in the area.
Safe to use? Pic below: