17670 or 18650??

[rizky_p]

Hi all, i Have flashlights which takes 1x18650 and 2xRCR123. therefore 17670 lithium should fits nicely but what is the advantages of using 17670 over 18650? i was thingking of getting one.

Thanks

 

[half-watt]

Hi all, i Have flashlights which takes 1x18650 and 2xRCR123. therefore 17670 lithium should fits nicely but what is the advantages of using 17670 over 18650? i was thingking of getting one.

Thanks

i'm relatively new to Li-ion use for flashlights (started earlier this year), so take my words with a grain of salt.

performance wise (brightness & burntime) won't be as good. also 17670 suffers from a bit more voltage sag (affects brightness in some applications) under heavy load than 18650 (or so i just read today in another Thread, but it makes sense - it's a principle of batteries in general not just Li-ions - size does make a difference in some cases).

advantages of 17670 might be a slimmer tube (lighter in weight and fit in pocket better??? might be important for someone???) and more importantly some flashlights without custom tubes won't accept an 18mm diameter cell (like the 18650 or 18500 cells), but a 17mm diameter cell (like the 17670 or 17500) will fit.

hope someone can give you a better answer than this Post.

 

[DM51]

You say your flashlight can take an 18650, so you have no need to bother with a lower-capacity 17670. 17670s are used where the internal diameter is too small to take 18650s.

 

[Bullzeyebill]

Hang out in the battery, etc forum for battery answers.

Bill

 

[labrat]

Top photo, from top,a Mirage_Man body that takes 18650 cells, and a standard Surefire body that takes 17670 cells.(The head on the 18650 body is not screwed fully in, they are both approx. the same length!)
Lower photo, the 18650 and the 17670 cells.
The 18650 are a bit thicker than the 17670, the capacity is 2400 mAh/18650 versus 2200 mAh/17670.
Capacity is a little higher on the 18650, so if you can use them, there really is no reason to go down to 17670.
But usually you need special body's that takes the 18650 cells, whereas the standard bodies takes 17670 cells, so if that is the case people use 17670 cells.
These I use are both non-protected cells, protected cells are still a bit thicker and longer, and a protected 17670 might not fit in a standard 2x123-body!

 

[Bullzeyebill]

labrat, what brand is the 17670 and where did you purchase it. Never, ever have seen that many mAh's in a 17670. But I want one if it is true.

Bill

 

[labrat]

No-name cells from DX, cheap, works OK.
Have not tried to test out the true capacity on these, I would doubt they really have the advertized capasity, but none of the cells I have seen so far do!
But for the prise, not a bad deal.
And they fit in the Surefire body, not tight!

 

[rizky_p]

So the conclusion is, that as long as 18650 fits dont bother with 17670?

 

[DM51]

So the conclusion is, that as long as 18650 fits dont bother with 17670?

Correct.

 

[Windscale]

So the conclusion is, that as long as 18650 fits dont bother with 17670?

Agreed.

Except in the case when you want to standardize your batteries so they became interchangable. For example, I have a P3D CE, an SF and an UF (for 18650), If I want batts to be interchangable I would use 17670 in my UF and P3D CE so when I go outting I need only bring a charger with one type of batts.

 

[labrat]

Agreed.

Except in the case when you want to standardize your batteries so they became interchangable. For example, I have a P3D CE, an SF and an UF (for 18650), If I want batts to be interchangable I would use 17670 in my UF and P3D CE so when I go outting I need only bring a charger with one type of batts.

Which charger takes 17670 cells, and not 18650?

 

[Windscale]

Which charger takes 17670 cells, and not 18650?

All my Li Ion chargers can charge 17670s and 18650s. I have 3 chargers, namely, DSD, WF139 and MH. The WF139 can charge RCR123As with the aid of magnet spacers. The MH can revive exhaused batts but the charge takes a long time.