Make sure you check the specs on the batteries. I noticed some of the 18650 and 18500 batteries are much longer in size and when you screw on the end cap it doesn't go all the way down onto the tube. It will still work fine but you will have a little gap between the tube and the end cap. The high drain AW's fit perfect! I highly recommend getting the proper battery
Most of the non IMR batteries that I have tried go up to about 5.1V with a 3ohm atomizer, this is the max those batteries can output. Once you have the AW high drain cells you are good all the way up to the max the device can do.
How tight of a squeeze is it with the 18650 extension cap? the 2900 measure out at 68.16mm.
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