I went for a Bosch battery powered one and I can just about get front and back done on one charge providing it's not too long and/or wet, which is broadly 80m2. The first cut of the year I need to do the front and then charge it up before doing the back. It's okay, I would've gone petrol but the mower my dad gave me was knackered beyond repair (despite him claiming it was easy to fix LOL)!