Originally Posted by shocker360

Congrats John on your purchase of the GPX4 Pro. Since you are in Singapore, your best and closest supplier of GPX4 parts including batteries would be from RC Mart by Dinball. I've bought lots of upgrades from him and his prices are great, even after paying for shipping
A 5 cell 2/3 6V stick pack Receiver battery is your best bet. RC Mart sells an Intellect 1400mAh 6V (#14005B) for only $14.60 USD. I have this battery and a full charge will last you through a day of racing.