Thanks to the generosity of Alba Vapours, I got my hands on an Efest 3400mAh protected 18650.
At 1A constant discharge, it leaves the likes of AW and Xtar 3100mAh trailing:
Thev high discharge pcb allows a discharge current of over 5A, here is constant 5A discharge:
The Totally Wicked stated "protected" on the label, but had no protection.
I have been assured that the Torchy batteries are IMR (LiMn2O4) but the internal resistance is on the high side, although lower than any LiCo2 standard Li-Ion battery I have tested.
Actual Capacity (mAh)
Torchy 850mAh...
Bottom one is fake. I have several Aw of all sizes. None have the additional printing and test results are as expected from AW.
If you want to send me one of the fake ones to test, I'll send you a SenyBor IMR 2250mAh to try (button top) or Panasonic CGR18650CH (flat top).
I have been trying out a few of these Efest batteries, and have some more sizes on the way. They look pretty good quality.
Here is a comparison of the Efest IMR 1500mAh and AW IMR 1600mAh and Sanyo Ur18650W2:
Check what happens when an IMR is short circuited here: Callies Kustoms IMR Battery and AW short circuit observations - YouTube
Compared to Panasonic Li-Ion here:Callies Kustoms 3100mAh Panasonic 18650 batteries on sale now! - YouTube
P anasonic NCR batteries have a built in PTC device and...
IMR should have a lower internal resistance compared to LiCO2 and should be able to deliver higher current with less thermal build up, but they still need to be handled properly. The major brands of Li-Ion such as Panasonic and LG will withstand short circuit. Panasonic NCR batteries also...
This is a great site to compare various makes and sizes of battery:
AkkuDB
It's in German, but easy to understand. An English translation is coming soon.
The Efest 18650 IMR are easily a match for AW, the 18350 are not quite as good:
Battery Internal Resistance mΩ Actual Capacity(mAh)
Totally Wicked 900mAh (protected?) 152 773
Trustfire 1200mAh protected...
The Panasonic NCR set new standards for LiCoO2 batteries with their heat reducing later and ability to withstand short circuit.
Generally, Lithium Cobalt aren't a problem unless you buy Ultrafire or anything that looks too cheap to be true.
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