Protected 14500s- what do they fit? Constant Current regulation?

[GarageBoy]

So I have a few Keeppower 14500s that I purchased for a project that did not work out, and they don't work with my lumintop tool. 14500 guys, what do these fit in? Also noticed a lot of lights have built in low voltage protection now, but many seem to be the FET+7135 type driver, which means you need IMR cells to get the most performance out of?

Also, what happened to good regulator boards? - everything seems to use a MOSFET to control "direct drive" mode for high and have a fancy micro controller with some 7135 chips to do with ramping etc - no one cares about driver efficiency anymore, outside of zebralight, muyshondt, etc?

 

[Msf]

The keeppower 14500 1000mAh fit in and work in my Frelux Synergy 2 and my EAGTAC D25As. I have both the Keeppower and the Vapecell 1000mAh and prefer the Vapecell as the Keeppowers length (longer than most other AAs and 14500s) limit their compatibility with different lights.

 

[Katherine Alicia]

Maybe this will answer some ones question in the future?
I can comfirm that a protected Keep Power 14500 will not work in the new Manker E03II, it`s just a tiny bit too long so the tail cap wont go on all the way and stays locked out, it`s fine with other 14500s though.

 

[GarageBoy]

Ended up picking another xml foursevens quark and a 14500 body - tried and true

What's the most efficient driver type for using a lithium ion with a cree xpl/xml single die LEDs anyways? FET? Buck/boost?

 

[night.hoodie]

Constant Current, and I assume among those, Direct Drive.

I think there may be some confusion between a driver with current regulation (constant brightness) and a constant current driver. The two are not mutually exclusive, but one is not the other.