Keychain light questions

etc · Jan 10, 2007

I saw this keychain light. It didn't use a flat watch battery but a tiny cylindrical battery, just like AAA, except much shorter and even smaller in diameter. What was it? And what kind of battery is that?

Lithium? voltage? Run time?

Secur1 · Jan 10, 2007

Chances are it's one of those cells used in car alarm units etc so it's just coin cells packed together 3-4.
The only AAA width cell i know that is short and sweet ermmmmm i ment powerfull is the 10280 Li-ion but only "custom" keychain lights use this one, like the Draco.

etc · Jan 10, 2007

No,it wasn't a coin cell at all, it was a miniature copy of the D cell - much much smaller, It's length was slightly longer than the diamter of a large coin cell.

FloggedSynapse · Jan 10, 2007

Assuming it's a lithium battery, it would likely be either a 'cr123' or 'cr2' battery. Lithium chemisty produces slightly over 3 volts when fresh - about double the voltage of alkalines.

There are several small flashlights that use the cr123; I'm not familiar with them.

I am familiar with the ION, which I've got. It takes a cr2 battery (smaller of the two) and has two modes, low which lasts close to 40 hours, and high which holds for close to 90 minutes.

http://www.photonsintl.com/cr2ion.html

kingoftf · Jan 10, 2007

Could be this one: CR 2 with 3 Volt 750 mAh (Ø x L) 15.6 mm x 27 mm

or this one for Carlocking Remote with 12 Volt: 38 mAh (Ø x H) 10 mm x 28 mm

Secur1 · Jan 10, 2007

etc said:
No,it wasn't a coin cell at all, it was a miniature copy of the D cell - much much smaller, It's length was slightly longer than the diamter of a large coin cell.

I didn't say it was a coin cell, i said that if u open the cell u will find stacked coin cells (but i didn't phrase it clearly enough so , sorry my bad).

Check out this thread i made about something similar, i posted some pics as well and i'm guessing this is the cell you found as well

https://www.candlepowerforums.com/threads/140473

Polar_Hops · Jan 10, 2007

erm, N cell?

etc · Jan 10, 2007

Yeah, it looks very much like that A23 cell.

Re: comment below - it has to be better than a single watch cell? How does it compare to a Fifth Element keychain light, the one where you get one for 50 cents kind of deal, it uses 2 coin cells.

Inside, you'll find eight small button cells literally stacked together and held together with a metal jacket. The capacity on it is incredibly low.

40mAh under 500µA load. Internal resistance spec indicates voltage drop to ~10.4v at 12.5mA.

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