I just discovered that the 5V (4.8V actually) batteries from another vendor fit in my V3!!!!
5 Volt NIMH 600mAh Battery for The Meglodon
5 Volt NIMH 600mAh Battery for The Meglodon
Nope. It slid right in! (TWSS) Fires perfectly!Very interesting. I wouldn't have thought that since the description says it's the same dimensions as the 18650. Did you have to make any modifications like removing/adding washers in the switch?

Not sure yet Steve. I just figured out they fit a little while ago. I'll let you know. I have 2 of these batteries and they both fit just fine, so I'm pretty sure it's not a fluke. BTW Steve....I'll take my "PureSmoker Innovation of the Year" reward in large bills please!
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I got my 5v batts today but am having no luck so far. The battery slides into the tube but is a bit tight. The problem is that they're too short to make contact with the adapter. I have one washer in. I'll try adding more washers this weekend when I have more time and energy to play with it. I'm using a 510 adapter.
That's strange. Do you have the V3.1 switch assembly in yours?