I never realized......

[Blackbeard]

How freakin big 18650 batteries were untill they showed up in the mail the other day. The dx pics are deceiving with no reference point. Here's a few pics with AA & AAA little brothers along with the light it goes in(Trustfire 801 also bigger than I thought -duh)and a couple of beamshots for the hell of it. Its probably the brightest light I have at the moment with the R2 emitter:

[Mike, Lord of the Spammers!]

That is a bit of a beast

[DaveK]

I've never even heard of those. Are they common?

[Zack]

Isn't it roughly the equivalent of 2 CR123's?

[Blackbeard]

I guess they're common in the flashaholic community...but you can't get them in a retail store as far as I know, online is only place I know of.

I think they are equivalent in size to 2 cr123, but with 3.7-4.2 volts as oppeosed to 8 volts of the 2 cr123 cells

[Zack]

I guess they're common in the flashaholic community...but you can't get them in a retail store as far as I know, online is only place I know of.

I think they are equivalent in size to 2 cr123, but with 3.7-4.2 volts as oppeosed to 8 volts of the 2 cr123 cells

I have seen them in my local radioshack.  Thinking about picking up one for my Fenix TK10.

[Blackbeard]

You'll need a charger as well if they're Li-on

[Black Rose]

Isn't it roughly the equivalent of 2 CR123's?

A 17670 cell is the size of 2 CR123A's.

18650 is a little bit bigger.

18650 batteries with Solarforce L2 and Spiderfire X-03 battery tubes.


From top:  AW 17670, Trustfire 16340, AW 16340, CR123A

As you can see from this picture, the Trustfire 16340 cells are a bit bigger than they should be.

[edap617]

I guess they're common in the flashaholic community...but you can't get them in a retail store as far as I know, online is only place I know of.

I think they are equivalent in size to 2 cr123, but with 3.7-4.2 volts as oppeosed to 8 volts of the 2 cr123 cells

I have seen them in my local radioshack.  Thinking about picking up one for my Fenix TK10.

18650 won't fit in the body tube of TK10.  TK11 yes.

[NutSAK]

The advantage of the 18650 is the energy density.  They are 3.7-4.2 volt just as the RCR123 (16340) batteries are, but they are 2200-2600 mAh, vs the RCR123's 750-800 mAh.  So, they're twice as long as the RCR123, but will provide more than 3 times the runtime.

In case you guys didn't know, 18650 means that the cell is 18mm wide, 65 mm long.  RCR123s are 16340, or 16mm wide, 34 mm long.

AAA = 10440 or 10x44mm
AA = 14500 or 14x50mm

[nuphoria]

Oh, that's a great bit of info, thank Nutsak 

I didn't realise they were quite that big either - makes sense now.

[J-sews]

Oh, I didn't know that either. Thanks Terry.

[John]

Just some info if you use rechargeable  LiIon Batteries 

LiIon Charge Status as you can see do not let them discharge below 3.8v 

4.2V – 100%
4.1V – 87%
4.0V – 75%
3.9V – 55%
3.8V – 30%
3.5V – 0%