Zippy battery cell quality

I run a couple of the Zippy-H 5000 20-30c 3s packs in a VXL Slash geared 29/76. Never had an issue with them running hot, showing any sign of stress or going out of balance. Even at cut off the cells are usually within 0.01-0.02 of each other in terms of voltage, and they take a good 4900 back. Good power and runtime too, even with the silly gearing and heavier Slash.

Considering that they set me back the price of a couple of decent 6 cell nimh packs I am well impressed with them.