Whats that battery called that is twice the length of a cr123

[SunnyQueensland]

Whats that battery called that is twice the length of a cr123 with the same voltage. and if possible do you know if it will fit in a surefire G2? is it the 17650 or 18650 or something?

Thanks

 

[turbodog]

It would be a 17670. 17mm diameter, 67mm long. That is an UNprotected cell.

If you want a protected cell, it would be longer. To compensate, you would use a 17650 cell (2mm shorter for the bare cell). Then the protection circuit gets added on top (adding back the missing 2mm) and the whole thing is shrink wrapped.

The voltage is different though. 2 123s have a voltage of 6v. These cells have a voltage of 3.7-4.2 (dead to full charge) volts.

Certain lights have circuitry to compensate for the lower voltage, while still outputting the same amount of light. The L4 is famous for that.

The g2 though..... it would light up, much dimmer than normal though. I hear that there are regulated brightness led retrofits for the g2. You might ask around for one of them.

 

[SunnyQueensland]

Top response, and fast.

Exactly what I needed to know. Thanks. :bow:

 

[knot]

Many 18650 torches also use 2X123 - wouldn't that be twice the length but the same voltage of one 123?

 

[lctorana]

No, its quite definitely the 17670.

The 18650 is obviously fatter, to the extent that it usually doesn't fit in the barrel of torches designed for 2xCR123A. And it's a smidgin short, too.

But the 17670 **usually** does fit.

 

[knot]

No, its quite definitely the 17670.

The 18650 is obviously fatter, to the extent that it usually doesn't fit in the barrel of torches designed for 2xCR123A. And it's a smidgin short, too.

But the 17670 **usually** does fit.

Has anyone ever seen a flashlight that said "Takes both 2xCR123A or 1x17670 batteries"? Not me, it's always, "Takes both 2xCR123A or 1x18650 batteries http://www.dealextreme.com/details.dx/sku.2672

Of course, maybe OP is looking for a battery for an existing flashlight that only accepts 123. A future purchase of mine will be 2xCR123A or 1x18650 which seems to be standard in offerings.

 

[jrv]

I've got a couple of cheap Chinese lights with battery tubes that are not wide enough for 18650 but 2x CR123 fit fine.

The Gotham takes 18650 but also comes with a thin tube you can put 2 CR123's into: the tube makes it 18mm in diameter so the CR123's won't rattle inside the 18mm battery tube in the flashlight.

 

[jbviau]

Has anyone ever seen a flashlight that said "Takes both 2xCR123A or 1x17670 batteries"? Not me, it's always, "Takes both 2xCR123A or 1x18650 batteries

How about the SF G2? A 17670 fits perfectly in this light, but an 18650 is too fat for it.

 

[knot]

How about the SF G2? A 17670 fits perfectly in this light, but an 18650 is too fat for it.

I will never buy an SF.

 

[Anders]

In some lights the protected 17670 is too large in width.


Anders

 

[HEY HEY ITS HENDO]

The Gotham takes 18650 but also comes with a thin tube you can put 2 CR123's into: the tube makes it 18mm in diameter so the CR123's won't rattle inside the 18mm battery tube in the flashlight.

...........hmmmm, Fenix should have done this with the P3D RB100 (2xcr123, 1x18650) .............. maybe one day ...........

 

[barkingmad]

Pretty sure a CR123A is 'supposed' to be a 16340 size (i.e. 16mm diameter and 34mm long) - so technically neither a 17670 or 18670 are quite the same.

But quite often a 17670 is 'near enough' to physically fit but you need to check the circuitry will run on the lower total voltage - i.e. 1 x 17670 is up to 4.2v whereas 2 x CR123A/16340 would be up to 8.4v.

 

[SunnyQueensland]

How about the SF G2? A 17670 fits perfectly in this light, but an 18650 is too fat for it.

The G2 is what I want to use this battery in. I saw a multi-mode CREE drop-in that is only suited to a single cell, so the lower voltage is what I need in this case. I have been looking for a suitable charger for a 17650/17670 but this could be an issue for me as I live in Australia. see below:

ALSO: If anyone knows how to tell what voltage I should charge an rcr123 cell if it does not say on the battery itself then let me know. Is it 3.0v or 3.6v? I measured the voltage with my DMM and one says 2.1v and the other 2.4v. This leads me to think that they may be 3.0v cells (they are both the same brand and type)

Thanks

 

[scott.cr]

Has anyone ever seen a flashlight that said "Takes both 2xCR123A or 1x17670 batteries"? Not me, it's always, "Takes both 2xCR123A or 1x18650 batteries

That's borderline false advertising, because it's really an 18650 light and two CR123s happen to fit into it.

 

[LED61]

That's borderline false advertising, because it's really an 18650 light and two CR123s happen to fit into it.

Usually, if a light will take an 18650 it is a given it will take a 17670, but not viceversa.

 

[knot]

Well then I have drop-in module than can run 2x123 or 1x18650 but the host won't fit 18650 so is it better to use 17670 than 2x123 for longer run time? Wait, I only have a 123 charger but can't I run wires to the 17670 cell to charge it?

 

[OldGreyGuy]

I have been looking for a suitable charger for a 17650/17670 but this could be an issue for me as I live in Australia. see below:

<<Photo removed>>

ALSO: If anyone knows how to tell what voltage I should charge an rcr123 cell if it does not say on the battery itself then let me know. Is it 3.0v or 3.6v? I measured the voltage with my DMM and one says 2.1v and the other 2.4v. This leads me to think that they may be 3.0v cells (they are both the same brand and type)

Thanks

Hey SunnyQueensland,

Glad to see that it is not so sunny in Brisbane today

I bought a set of protected 17670 cells plus charger from AW over in the dealer forum, refer to this link.

The charger he sells will handle Australian voltages and he usually includes an adapter for the plug we use over here although I find it easier to plug into one of the other multi adapters I have permanently attached in my study (a legacy of previously living in both the US and UK). The voltages for that charger are preset for the Li-Ion type batteries and work fine for the protected Li-Ion 17670 he sells.

I've got a number of lights that either take 2xCR123 or 1x17670 though sometimes the width of the battery can be a tight squeeze, for example I have 2 Aleph 2xCR123 tubes and only one will take the 17670

I also have a couple of LiFePO4 type RCR123 and these need to be charged at a lower rate but there is an Ultrafire charger which can be set for this battery type.

So far I've made about 3 or 4 purchases from AW and have had no problems receiving shipments from him in Hong Kong to Australia.

 

[lctorana]

Of course, maybe OP is looking for a battery for an existing flashlight that only accepts 123.

Me, too.
I got my "Golston 7W" from eBay, it was a 2x123 torch, and was direct drive (no resistor!), so I fried the LED.

Even the skinniest of my 18650s won't fit, but a 17670 should.