I wanted to be able to have more battery life for my Scout, so I bought an automotive male/female plug set at Auto Mart. I took one end of it and wired it into the Scout power cord. To do this I simply cut off the original battery fittings, put the new wires together with the original wires and added new fittings.
In my sled I have a bank of two of the larger 7Ah batteries (like for the lux) These are wired in parallel so I still have just 12 volts, but now I have 14Ah worth of juice. These run my hut string lights etc. I added a pigtail to the other end of the auto male/female plug. Now, I can use the Scout on it's own, or... when it is mounted on the side of my hut sled, it can be plugged into the other batteries. Works great.