I have a lister laser 2 that goes onto a 12v car battery!
Its easy to take places and very convenient, however the handpeice weighs 1.6 kilo and I have very little hands, I struggle to hold the handpeice for a long period of time as its just so big so I cant wrap my hands around effectively
However I think all battery handsets are going to be similar as the works are in the handset
I got tired of trying to use it and I didnt think it was working properly (most likely just needed sharpening) so I did my flock of 20 adult sheep by hand with some nice sharp blades