Is anyone traveling with these on board? Wether for yourself, or some unlucky boater. Just curious.

Yea I have a pair

Booster pack, easier. Sometimes you need veeeery long cables to be able to connect...

Yup. A battery switch

Seatow!!!

in theory, with a multiple battery system that is properly kept and managed, you should never need one. on a side note you should also never run with the battery switch in the "all" position, that is only for starting purpose. if you are one of those guys that runs in the "all" position. . . . . . better pick up some jumper cables

Please help me out here, with twins/triples I'd never run in the "All" position, start there if necessary then switch engines to their individual battery(s) to isolate a bad battery or slowly get some charge into it.

With a single, if I have one crook battery, if it's not totally dead, I would have thought running on all batteries might get some charge into the tired one while maintaining the good one(s). If I'm out for the day, I hate worrying that I only have one good one. When at anchor, I always isolate batteries.

RR

I helped out a guy one day at a boat ramp. Had to go back to my truck to get cables. I got him started and he left a big scratch in my boat that didn't notice until I pulled the boat later that day.

you can run in the all position in necessity but don't make a habit of it and correct whatever problem as soon as possible. if you have a battery that goes down from use like running a stereo all day, switch to all and start the dead side but switch back to it's parent system and allow it to charge normally. it still comes back to managing charge and maintaining the system, but if you have an issue out on the water then by all means use the "all" position as needed. Not sure if you gain any charge advantage in running both, I would think letting the low sides charge on it's own would be better.

I don't carry much in the line of tools these days, but I still carry a set of jumper cables. That said, in 20+ yrs. of boating, many of those yrs. with a single engine and one battery, I only used them once.