Amazon.com: 4.5V 1Amp AC to DC Adapter Power Supply, 4.5W 1000ma AC 100-240V to 4.5V, 2.5mm X 5.5mm Plug(Pay Attention to The Size. Make Sure it Works for Your Products) : Electronics
TACTICAL TRANSPORT HELICOPTER CHARGER
US Plug AC/DC 4.5V 800mA 0.8A Power Supply adapter wall charger 5.5x2.1mm | eBay