Anyone used something like this for portable charging? (EGO)

I have an EGO lawnmower and one of their 7.5 amp batteries.

https://egopowerplus.com/battery-7-5amp/

I ran across their portable power inverter and was wondering if it might be worth picking up as a portable power solution for my XR. Especially because I already have the battery.

https://egopowerplus.com/nexus-escape/

Was thinking it might be good to have something to take with me while camping or day trips to some trails. Would it be worth getting one of the fast/ ultra chargers to use in tandem w/ this? Edit -looking at it, maybe the ultra charger isn't for the XR. Disregard that piece if so.

You all know a ton more about the battery / charging stuff than I do so I thought I'd see if anyone had any thoughts.

Thanks so much. Love the community and my Onewheel has kept me sane this year!