Hey Kris, Just about any battery between 8V and 12V is ok. The mAh (milli-amp hours) is an indication of how long the battery will last; the more the longer the battery lasts. You’ll need to balance this with the increase in weight you see as the mAh goes up. Also, a helfpul note: Lipo batteries can sometimes be damaged if they’re drained too far. If you’re going to do this, you may want to keep an eye on the voltage of the battery to ensure that you’re not draining it too far. There is software built into the GoPiGo for doing this.
The link you provided didn’t lead to anything for me, maybe you can try to post it again?