I've got the Noco GB40 and rigged it up to run a Rule iL500PK Marine 500
GPH Inline Submersible Pump for pumping out the dinghy, kayaks, etc. The
battery doesn't last so long doing this but it works.
My one complaint would be the proprietary connectors that Noco uses.
_
There was a start of a discussion on another thread of what comprised a good
Lithium jumper the other day, and I think it died on the vine.
I did some research on this a year ago, and bought what I think was (one of)
the best out there, and I am still amazed at the quality, versatility and
usefuln