Hey. Take with a grain of salt as I have not used these cells or tested them. But if they are in fact regulated to 3.0v each, then regardless of the load, they will put out 3.0v. So 6.0v total. Fivemega tested them with a p60 and got 5.8v. So pretty close and could be an error somewhere. I do not believe the tail cap switch adds 0.8 v of resistance. He assumed that but that assumption is wrong in my opinion. I've never seen anything to suggest a switch adds anywhere close to that. So that means you're feeding a lamp designed for 5 volts, 6 volts. That's a big jump. In my opinion you will be accelerating the wear of your lamps by quite a bit with these cells. Something like a p91 is designed to run on 6.6v. Running on 2 regular lithium ions will give approx 7.4-7.6v freshly charged. And last one I did that with only lasted a couple hours of use. So it's the same amount of overdrive.
If wanting to run rechargeable cells, your safest bet is to run a 3 cell lamp. Like a p90 or a lumens factory sr9. Or check out kaidomain for one of their 7.4/9v lamps. They're like $3 each and excellent. And use two normal 16340. Or better yet, a kadomain 3.7v lamp and a 16650. These are a bit brighter than a p60 and are cheap and great
If wanting to run rechargeable cells, your safest bet is to run a 3 cell lamp. Like a p90 or a lumens factory sr9. Or check out kaidomain for one of their 7.4/9v lamps. They're like $3 each and excellent. And use two normal 16340. Or better yet, a kadomain 3.7v lamp and a 16650. These are a bit brighter than a p60 and are cheap and great
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. Considering that I rarely use it for more than a minute and more for the experience than actual need I guess primaries are justifiable. 
