Second Battery vs. Jump Box

[cfelton]

I mounted a second deep cycle marine battery with a selector switch. Ive have had to switch to it when my starter was failing. I dont think a jumper would have helped. If you do go with the jumper dont buy a Stanley, I saw three brought back to Sams club yesterday! I do buy the Duracell Deep cycle battery that Sams sells and have great luck with them.