Here's the mod for this ice season,
No, I didn't invent the battery box or the idea of putting lights in a shanty, but here's mine and probably unique for my needs made from an old tackle box.
I removed the 3 tiers of tackle trays leaving just one big open compartment. Many know (this thread) I devised a way a few years back to power my 19.2v drill used for augering with 24 volts from two sealed lead acid batteries wired in series.
The box supplies 24 volts out the top for the auger
and both 12v and 5 volts via usb on the front panel
I power the shanty lights via a cigarette lighter plug and the usbs will charge my phone or my tablet that I use with my Vexilar FishPhone underwater camera system. The cigarette outlet can power most anything, a TV, radio, mirrored disco ball, flasher or 110v AC inverter. I use a 9ah battery for the 12v side for a little more capacity and there's a regular 7ah for the secondary. The switch is just on/off for the 12v and 5v outlets.
Inside wiring, not too complicated, but provides both the 24v and 12v simultaneously
Hopefully the ideas might help someone out. I also added a very bright modded bar of LED lights in the shanty powered via a cigarette port on the battery box.