Is there a NiMH battery 18650 size?

[bigchelis]

If there was a NiMH battery 18650 size I could run 4 of them in a M30 or P60 MC-E both rated for up to 5.5v. I already have a hosts that can take 3 or 4 18650's. Just want to know if longer run times can be had with such a set-up.

Thank you,
bigchelis

 

[rmteo]

Look for a 4/3A size NiMH (1.2V, 4500mAH) such as this:

• High quality 4/3AF 4500mAh NiMH Cell
• Can be recharged rapidly at 1C rate up
• Standard Discharging Rate: 4.5Amp
• Dimension (D x H): 18mm (0.71") x 67mm (2.64")
• Weight: 2.2 oz (62.3g)

http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=2260

 

[gswitter]

Yes, 4/3 A. Here are a few examples.

If max capacity for a P60 host is what you're after, and you can't run Li-ions in parallel, I'd go with NiMH C cells.

 

[bigchelis]

Yes, 4/3 A. Here are a few examples.

If max capacity for a P60 host is what you're after, and you can't run Li-ions in parallel, I'd go with NiMH C cells.

Thanks that is what I was thinking. I alrady have the parts to make 3 or 4 18650 hosts with a 6P bored, but I wanted cells that could handle the 3.5amp draw and would have lower voltage so I could stuff more of them (non-parallel).

Now, I just have to ask Gene if his MC-E P60 on DD will work fine on 3 NiMH cells.

lovecpf

 

[mdocod]

Now, I just have to ask Gene if his MC-E P60 on DD will work fine on 3 NiMH cells.

lovecpf

It should work fine.

and most 4/3AF NIMH cells will handle 3+ amps no problem.

 

[lctorana]

Or 7/5 A (or 7/5 AF) as well

 

[bigchelis]

Yes, 4/3 A. Here are a few examples.

If max capacity for a P60 host is what you're after, and you can't run Li-ions in parallel, I'd go with NiMH C cells.

I just ordered the cells you recomended along with a Vanson charger. Someone else mentioned the NiMH 18650 size fits in the "D" size slot great.

Do these Cells really have 4500mAh?
What is the best guestimate on the capacity?

 

[Yoda4561]

I'd think it would be pretty close, going by volume they're just a bit smaller than a C cell, and far larger than a AA. I would expect at least 4000MAH of real capacity

 

[Christoph]

I got two of the 4/3AF cells and one came in at 4400mah and one at 4600mah both at just over .5 amp draw. They also did well at a 2.5 amp draw which was what I needed.(The sanyo)
C

 

[rmteo]

I just ordered the cells you recomended along with a Vanson charger. Someone else mentioned the NiMH 18650 size fits in the "D" size slot great.

Do these Cells really have 4500mAh?
What is the best guestimate on the capacity?

http://www.batteryspace.com/prod-specs/4.5AF.pdf

 

[MattK]

Interesting tidbit:

The 18650 size li-ion battery was developed as a replacement for 4/3AF NiMh cells commonly used in laptop batteries before the li-ions became available and then commonplace.

 

[ElectronGuru]

The 18650 size li-ion battery was developed as a replacement for 4/3AF NiMh cells commonly used in laptop batteries before the li-ions became available and then commonplace.

Wow, that makes so much sense but I never would have guessed. Any cool reason 340 cells are made to exactly half of 680s?

 

[IMSabbel]

because otherwise, they would be 330 or 350 cells?

 

[metlarules]

I use Panasonic 3800 4/3a cells( http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=4665 ) and Sanyo 4/3af cells (http://www.batterystation.com/nicads.htm). I use them in my 6p running a Malkoff M30WF. With the 4/3a cells the runtime is 4:20 hrs. With the 4/3af cells the runtime is 4:55 hrs. They also do not have the high self drain rate of high capacity aa cells.

 

[Kestrel]

bigchelis, MrGman posted some lumen measurements from the Malkoff M30 at various voltages in a thread of mine, here is the link (indexed to his post) if you might find that of interest.
http://www.candlepowerforums.com/vb/showthread.php?p=2953941#post2953941
It seems as though we should expect ~280 lumens from 4xNiMH.

 

[bigchelis]

bigchelis, MrGman posted some lumen measurements from the Malkoff M30 at various voltages in a thread of mine, here is the link (indexed to his post) if you might find that of interest.
http://www.candlepowerforums.com/vb/showthread.php?p=2953941#post2953941
It seems as though we should expect ~280 lumens from 4xNiMH.

Thanks, I looked it over.

My NiMH 18650 cells even with magnets on the + end do not work. I used it in a 6P bored with 2 18650 extentions, but no light. I tried the P60 P7 direct drive from Nailbender. After I got no light I then put a single IMR 18650 and the light works. I wonder what it could be.:sigh:

Any advise???

 

[Benson]

Wow, that makes so much sense but I never would have guessed. Any cool reason 340 cells are made to exactly half of 680s?

They're 2/3A (CR123A= 1x 2/3 A), where 18650/17670 are 4/3A(F); 2/3 happens to be half of 4/3. You'd be unlikely to find such pleasing ratios of sizes if they weren't both derivatives of the same basic A size. (In case you haven't scratched through the math, A = 17500, Fat A = 18500.)


BigChelis, only the annoying obvious sorts of advice... are they charged? is one backwards? are your magnets small enough? Since you've got magnets, the whole shebang should stick together on the bench, so it should be easy to check the voltage of the whole thing? (I assume you have a voltmeter...) I'm betting you checked those already, but that's all I got.

 

[bigchelis]

They're 2/3A (CR123A= 1x 2/3 A), where 18650/17670 are 4/3A(F); 2/3 happens to be half of 4/3. You'd be unlikely to find such pleasing ratios of sizes if they weren't both derivatives of the same basic A size. (In case you haven't scratched through the math, A = 17500, Fat A = 18500.)


BigChelis, only the annoying obvious sorts of advice... are they charged? is one backwards? are your magnets small enough? Since you've got magnets, the whole shebang should stick together on the bench, so it should be easy to check the voltage of the whole thing? (I assume you have a voltmeter...) I'm betting you checked those already, but that's all I got.

All the cells measure 1.4v, but I have not measured the 3 of them at once. I will try that tonight.

Thanks,
Jose

 

[ElectronGuru]

because otherwise, they would be 330 or 350 cells?

Yea, I just walked into that, didn't I?

They're 2/3A (CR123A= 1x 2/3 A), where 18650/17670 are 4/3A(F); 2/3 happens to be half of 4/3. You'd be unlikely to find such pleasing ratios of sizes if they weren't both derivatives of the same basic A size. (In case you haven't scratched through the math, A = 17500, Fat A = 18500.)

I'm not sure how, but that makes perfect sense. Thank you.

And I assume A's go all the way back to A, AAA, AAA? Reminds me of that story about how the rockets for Nasa's Shuttle are the same width as two horses...