Amazon.com: Blomiky 2 Pack 3.6V 700mAh AA Nicd Rechargeable Battery Pack with SM-2P 2 Pin Plug and USB Charger Cable for SY-E571 RC Excavator RC Cars 3.6V Battery and USB 2 :
3.6v 900mAh Ni-CD Rechargeable Battery Pack Replacement for Exit Sign – XML Battery