AA lithium ion?

[Kurzon]

Do lithium ion batteries come in AA format? I've read that lithiuim ion batteries can come in all shapes and sizes, but I've never found any on the Web (at least none that I can order). Do they exist? I've just ordered a Fenix L1D CE flashlight, which runs on a AA cell. The advertised output isn't as strong as that of its smaller cousin, the P1D CE, and I'm told this is because the manufacturer expected customers to use alkaline or NiMH cells, and that the L1D can match the P1D if it uses a lithium ion cell.

So, is there any such thing as AA lithium ion and, if so, where can I order them?

 

[Paul_in_Maryland]

Yes. It's called a 14500. You can buy it--protected (for safety and convenience) or unprotected (for higher capacity and current) from AW.

 

[yellow]

Notice: You won't have access to the lower levels with Your L1D-CE, You know?

 

[coppertrail]

Received my Ultrafire AA/AAA LiIon rechargables (unprotected) yesterday. The charger should arrive Friday.

For UltrFire 10440/14550 cells, DealExtreme's prices are hard to beat. $7.59 shipped for a pair of 14550 cells

 

[Quantumstate]

Charger?

 

[coppertrail]

Charger?

Charger
10440 Cells
14500 Cells

 

[Quantumstate]

Dang, the DSD 18650 CR123A Charger is only $4.20. Surely it's crap.

Ans anyone used this for more than 100 charges on a battery? Battery still good?

 

[AndyTiedye]

(Not sure how my reply to another thread ended up here, I didn't even see this thread before)

 

[bob_ninja]

I see 900mAh rating for 14500. I am not that familiar with LiIon. What kind of current draw can they tolerate? 2C, 3C,....
thanks

 

[Quantumstate]

Depends entirely on construction and chemistry. There are at least 4 LiIon chemistries. Only way to know max draw is the datasheet for that particular batt.

 

[altis]

There's some datasheets here:

http://www.gpbatteries.com.tw/html/techinfo/li_ion.asp

 

[bob_ninja]

Thanks

Seems 2C is the upper limit. Aksing because I torture my AA NiMH with 3C and 4C draws and some of them manage to survive.

 

[Quantumstate]

Well the charging rate is actually determined by batt temperature.

Don't want them to get above the temp rating.

 

[SilverFox]

Hello Bob,

Most consumer cells are rated to a maximum of 2C. It sounds that you need to check out the Titanium Max Power 1800 mAh NiMh cells. They are rated at 10C.

With Li-Ion cells you need to check the cell temperature at the end of your 4C run. If the temperature is above 160 F, you have damaged your cells. I don't like to see temperatures above 140 F, but they seem to be capable of a few cycles at higher temperatures.

On the other hand, I have tested some Li-Ion cells, staying within their specifications, and still had them die in 10 cycles.

Tom

 

[bob_ninja]

Yeah, I looked up Titanium but since I am in Canada, by the time I pay all the costs (shipping etc) I decided that it is cheaper to look for a deal on Eneloops in Canada (got a bunch from the Dell's 1 day special).

I tried 8 Eneloops in my "torture chamber" (peak 9A, averagee 7A)
Fully charged they are easily supplying all the current that the motor demands and the wires are actually getting hot. So they seem to be able to provide 4C easily. Plus they have low SD just like LiIon, so they work very well for my application.

I was just wondering if a single 14500 @3.6V replaces [email protected], then my pack could be smaller. I see that 14500s are about 1Ah (or less), so that would be about 7C-9C draw, which is pure evil. I would have to compensate by adding 1 or 2 more packs in parallel, but then I am back at the original big pack I started with using NiMH Eneloops. Just wondering, tis all.

I'll keep them in mind for future projects that don't need so much current. thanks