The jump starter I used to carry onboard was one of those that had a small
inverter built in so I could also run a
power tool for a short period of time. It was useful on the
boat for running tools up on
deck or ashore where there was no
power. I even used it to jump start other people's boats and cars at times. I suppose it depends on if you have a good place to store such a thing, but in my case it wasn't any "trouble" at all and proved to be a useful tool.