This lawn mower from Yard Force is battery-powered, a great choice for you with a small or medium-sized lawn.
From Amazon
Yard Force 20V 33cm Cordless Lawnmower with 4.0Ah Lithium-Ion Battery & Quick Charger - LM C33
Wilko
Yard Force LM C33 20V 33cm Cordless Lawnmower
Robert Dyas
Yard Force 20V 33Cm Cordless Lawnmower W/ 4.0Ah Lithium-ion Battery & Quick Charger - Orange & Black
Downtown
Yard Force - LM C33 - 20V 33cm Cordless/Battery Push Rotary Lawnmower