yeah the Ultrafire 26650 is marked 3.6V at full charge (see 4th pic). You could charge them with a Hobby Charger.
Or if you were diligently watching the charge and pulled the battery from the charger when it reached 3.6V, tested with a DMM (digital multi-meter) of course. I charged ~60 18650s like this. I didn't want them stored at full charge, so I pulled them at ~3.5V.
The LiCo TangsFire 26650 has got the normal voltage range (4.2-2.7V), but the capacity (6000mAh) is not realistic. **See HKJ's explaination here.
In the future you might consider some King Kongs. KumaBear sells both protected and unprotected ones here
You mentioned some 18650s which are marked 3.7V. That refers to it's nominal voltage. But they really are 4.2V at full charge and should only be run down to 2.8/2.75V, and no more. Nominal, meaning in name only.
Another example is the naming convention of your 18650 Li-ion. Your 18650 batteries should be exactly 18mm wide by 65mm long. But many cells are actually a bit longer, especially if they have protected circuits on them.