Two batteries had 3.81 volts, two batteries had 3.82 volts open circuit voltage.
Then I grabbed the batteries in the charger UltraFire WF139 and heated to above 30 ° C.
After addressing the green LED of the charger I have taken directly from the battery and they had 4.1 volts.
The charging time was approximately four hours.
Since the first of January, the batteries now stuck in the spare battery pack and have broken down in this short week to 4.08 volts.
Yesterday I was then for the first time with battery at night cache and the TK35 remained in high mode about 2 - 3 hours.
Even for a total of 10 minutes, the lamp was in turbo mode.
After that, the batteries were each still 3.84 volts.
So I can say that the EagleTac 18650 2.4Ah batteries are exactly in the specification and perfect fit for Fenix TK35.
However, I had the UltraFire WF139 charger is the problem that the positive poles of the batteries had no contact with the positive poles of the battery charger.
I had only a little "modding", so that the batteries have to work with the loader. Just make sure to read my review for WF139 by!