INVENTO 5V 1800 Mah Polymer Ni-Mh Rechargeable 4 Aa Cell Battery Pack with 5. 5Mm Dc Jack Adaptor Port for Uno Toy Car Diy Project : Amazon.in: Electronics
Amazon.com: tegongse Replace 2X AA AAA Battery Eliminator USB 5v to 3v Step-Down Cable for Radio Toy - Input DC 5V 2A, Max Output DC 3V 1A : Electronics
Powering Nano and Servo with single battery and 5v Regulator - General Electronics - Arduino Forum