Capacity of li-ion cells

[ateallthepies]

Hi all, noob question.

From my searchings, it seems the 18650 battery has the highest capacity of the lithium batteries we use in our flashlights?

Is there a need for a new class of cell with all these new super bright LED's and incandescent bulbs forever coming out?
I am thinking something along the lines of a C cell width battery with a length similar to a 18650.

Would someone like to estimate the capacity of such a cell if it existed?

I am thinking it would be nice to have a power system capable of delivering the bright 'turbo' mode light for two, three or more times the run time of current 18650 lights.

Steve.

 

[Tekno_Cowboy]

There are also C, D and F(1.5D) cell sizes in Li-ion, and M cells in Li-poly IIRC. The M cells hold over 30W/h capacity.

 

[rmteo]

...I am thinking something along the lines of a C cell width battery with a length similar to a 18650.

Would someone like to estimate the capacity of such a cell if it existed?

Steve.

LiMnNi Rechargeable 26650 Cell: 3.7V 4000 mAh, 10A rated 14.8Wh
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=5161

LiFePO4 26650 Cell: 3.2V 3400 mAh, 17A Rate, 11Wh
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=2385

 

[lolzertank]

LiFePO4 26650 cell: A123 ANR26650M1A: 3.2V, 2.3Ah, 70A max continuous drain, not so many watt hours.

But you do get 200+ watts for a 2 minutes. oo:

 

[ateallthepies]

Looks like I need to carry on with my research as I never had heard of those types of batteries

Are there many flash lights that use these bigger batteries?

Thanks,

Steve.

 

[Patriot]

Are there many flash lights that use these bigger batteries?

Not many really. Most will be customs. My guess is that they'll remain somewhat specialized unless they're popularized in other devices such as laptops.

 

[rmteo]

You can use a 2C light with a 35mm. spacer - assuming the voltages are appropriate, of course.

 

[lolzertank]

Heck, not even that many lights use 18650s. Most use AAs and Ds.

 

[lolzertank]

You can use a 2C light with a 35mm. spacer - assuming the voltages are appropriate, of course.

You can also use a 3C light with a 20mm spacer and 2 cells. You might be able to get away without a spacer since most cells are a bit longer than 65mm and the spring (at least in Mags) will make up a lot of space.

 

[Capo_au]

I have had my eye on this 3.7v 3,500mAh Rechargeable Lithium Battery for a little while.

The label for it states 5,500mAh but dont believe it for a second.

 

[Chodes]

I have had my eye on this 3.7v 3,500mAh Rechargeable Lithium Battery for a little while.

The label for it states 5,500mAh but don't believe it for a second.

My eye is on these:
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=5161

Capacity stated as 4000maH. Believe it. :thumbsup:
http://www.candlepowerforums.com/vb/showthread.php?t=234724

Shipping is only $75 :sick2:
I called. They said put personal note to use USPS and they would refund later. Sounds good, as long as they remember to read the note.

 

[Vikas Sontakke]

Are there any chargers which can measure the capacity of lithium cells similar to LaCrosse BC900?

Never mind, I just ordered Thunder AC6; It is way cheaper than I would have expected it.

- Vikas

 

[Mjolnir]

I ordered a pair of the 4000 Mah 26650's for my ROP, and hopefully they will come today or tomorrow (well they better, since I ordered them a week ago...).
They should be able to fit in a 2D mag with a cut down spring. I am currently using 2 18650s in my 2D mag, and they work fine, so these cells should also fit (since they are wider, and probably a little shorter because of the lack of a protection circuit).