Scooter Mobility

My Mobility Scooter Has A 270W Motor. It Operates With Two 12V 12AH Batteries. The Battery Charger Works Only With 110 Current. Voltage Converters Seem To Be Rated By Watts. What Capacity Voltage Converter Would I Need To Purchase To Recharge My Batteries In Europe? I Don't Want To Tote Around Any More Bulk Or Weight Than Necessary. Same Question For A 450W Scooter.
My Charger Is 2amps.