If you can't easily change the battery - the re-charge option would be a must.
The run time during their show and tell was fine the lowest power setting.

For the price, it might be fine to slap on a 22lr plinker. Esp assuming that their life time warranty is worth something.
I could also see this as an option for a PCP style pellet rifle - but all in the plinking use.

I am not a fan of non-replaceable batteries - the online owners manual has zero tech info on it.