12V 0.5 Amp Battery Charger from the Batteryworldshop.com — The Battery World Shop
12 Volt Power Supply 1 Amp Standard (12V 1A DC) 12W AC Adapter 12VDC 0.5A 1.0A 500mA 1000mA Power Cord Cable Battery Charger PSU w/ 5.5mm (OD) x 2.5mm (ID) Center Positive
Pololu - Understanding battery capacity: Ah is not A