We have a stihl petrol hedgecutter, but I don't use it as it's too heavy for me and my beloved 170 chainsaw that when purchased 20 years ago, I could whizz around with no problems! I think due to grip, iffy fingers and vibration aftershocks, I could proberly tolerate 10 minutes max with it now.
However, your question was battery related. My nephew in law (makes me feel old as I'm 16 years older than him and made him laugh when I said I was old enough to be his mother!) Bought himself a spear & Jackson hedgecutter from Argos, 2 batteries. We liked it, I bought one!
It's fab! It charges within the hour, it's light enough, it stops reasonably fast and it's well balanced. I also bought the cordless pole saw, same battery. Mum and I have enjoyed using that! Though the head is at a fixed angle, I shoved her in the zetor fork with cushions and lifted her up and she lopped off oak branches. She enjoyed herself and now the zetor can get under the trees, previously we were hitting the roof. (Got damsons with mum in the fork too! Safer than a ladder!)