VariCore 32700 LiFePO4 6500mAh (Gray)
Discharge current: 35A
Maximum current: 55A
Large LiFePO4 batteries with good capacity and high current rating.
The two cells tracks fairly well and has no problem delivering 30A with nearly same capacity as at low current. As usual LiFePO4 has a very flat discharge curve.
This looks like good batteries, they can deliver a lot of current and has fairly constant output voltage.
Notes and links
How is the test done and how to read the charts
How is a protected LiIon battery constructed
More about button top and flat top batteries
Graphical comparison to 18650 and other batteries
Table with all tested LiIon batteries