Summary

I am not sure if all dads are makers. But if your’s is – how about a new mobile power supply? Or as an alternative: If you are a maker make this as a gift to yourself.
The idea is to have a adjustable power supply which is battery powered so you can do quite a few things mobile. You could do this with battery integrated battery cells, with an usb powerbank or with batteries from your favourite tools. 
This time we need a little bit more than just the xTool, some plywood and glue. In addition you will need a battery holder, a voltage controller (I took an 80A 5A Buck Boost power supply controller), some connectors, terminal connectors and a crimping tool, a soldering iron and some screws.
I have seen something similar in a free online configurator, but unfortunately their design did not match my components. Actually many controllers, connectors and battery holders are different in their sizes. I have uploaded my design, but it might happen that it does not fit your components.