Ha! How are you finding the battery life on it? Was thinking of one for the same train reasons but mine would be a 3 or 4 hour each way job for when I'd want it.
I only do ~hour each way and a bit at lunch, it's ok with the battery.
Officially it's 6 hours, but they do say it's much less with games (they quote Zelda being 3hrs game time)
It's usb-c and the charger they supply is pretty fast.
Battery pack may help with longer journeys?
I picked up a Switch and have been playing Skyrim.
Forgot what a timesink it is.
Train journey to work is too quick now...