Is it possible to add a battery

"The power consumption of your battery is 30w.

You need something of massive capacity, something like this:

https://www.amazon.com/Portable-Generato..."

I like reviving olde threads, especially ones with no decent answer! I found lithium scooter battery packs with built in BMS charging circuits integrated on Ebay. Wire in a charger for when the thing’s plugged in and you’re solid, long as you can also convert the electricity inside to amp the board, also :)