I liked the small power box I made for my little 2 man bass boat so much that I made another one for the main boat. It has cigarette plug, two USB ports, two banana post and two plugs for the live scope unit. It's portable and just plug in the Livescope to be ready to go. I can also use it for plugging up my green lights at night, charging my phone, charging GO Pro unit and any other accessory you can think of. I have some small led lights on the way and I will attach them to the box when they come in. This way I can use it as a flashlight if needed. My 30ah lithium fits perfect in the ammo box. All total it cost $35 to build less the battery. I highly recommend building you to take on the boat , kayak or out camping. Just bring inside and hook it up to recharge. No need to carry fullsize batteries. Here are some pics.

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