Lithium ion c cells

[vicv]

I know the aw ones have been gone a long time and no one cares for this size light anymore. But I still love the "C" cell diameter lights. Is there anyone making a decent 25500? Currently I'm using 2x18500 in an adapter but it's wasting capacity space

 

[ampdude]

I hear ya. I've always loved the C format and it should have been the logical step for lithium ion progression. But changing battery sizes every few years allows a lot more things to be sold, since the old stuff isn't compatible anymore. I also miss 17670 cells. And 17500 cells are pretty scarce these days as well.

 

[ANDREAS FERRARI]

Oddly enough I logged in to find an answer to this same problem. I have a M@G '633 (a 150 watt bulb overdriven to 225 watts by an AlanB programmable Hotwire driver) and my 5 AW 26500 cells can no longer handle the massive draw required for the bulb.

If anyone can help I would appreciate it. This is my favorite 'showoff' light and never intend to part with it.

 

[Olumin]

I use efest 26650 in Mag Ml25 wih 6 cell bulb. It works but I need a magnet to get the batteries out. If your light has bigger tube it might fit. But its also a little longer. I love 30mm diameter c lights. Best ergos ever.

 

[vicv]

I looked at those efest but they don't look very good on hjk's test. Pretty bad voltage under load. My 18500s perform better. And ya that's a tight fit

 

[Olumin]

I looked at those efest but they don't look very good on hjk's test. Pretty bad voltage under load. My 18500s perform better. And ya that's a tight fit

i mean 26500 sorry. Its like the only one they sell here.

 

[vicv]

That's ok. Thanks I knew what you meant. Saw you had them in another thread.

 

[vicv]

Ya in my case its for the same light. ML25it. I'm using a 7212 tad bulb

 

[snakebite]

I hear ya. I've always loved the C format and it should have been the logical step for lithium ion progression. But changing battery sizes every few years allows a lot more things to be sold, since the old stuff isn't compatible anymore. I also miss 17670 cells. And 17500 cells are pretty scarce these days as well.

16650 are still made.
close enough to 17670.

 

[ampdude]

16650 are still made.
close enough to 17670.

I'm aware. Unfortunately the size that isn't made which also fits stock Surefire lights, 17670's, would have more capacity.

 

[fivemega]

my 5 AW 26500 cells can no longer handle the massive draw required for the bulb.

Welcome back to board.
Regular Li-ion cells can not provide current of 633 bulb. Look for MRI 26500 cells.

I love 30mm diameter c lights.

C cells have 25mm diameter.
Is that what you meant?

I looked at those efest but they don't look very good on hjk's test. Pretty bad voltage under load.

Those are for low current devices and not good for even 1 Amp.

I'm aware. Unfortunately the size that isn't made which also fits stock Surefire lights, 17670's, would have more capacity.

AW's 17670 protected cells are 1600mAh and today's protected 16650 cells are 2000 mAh

 

[325addict]

Ya in my case its for the same light. ML25it. I'm using a 7212 tad bulb

But how does the reflector survive that? Mine started to melt I think 20 seconds after I switched on that same bulb as you use....

 

[vicv]

I drilled.out the reflector opening to get the plastic away from the bulb

 

[Olumin]

C cells have 25mm diameter.
Is that what you meant?

Nah. My c mag is 30mm diameter. Not the batt.

 

[ampdude]

AW's 17670 protected cells are 1600mAh and today's protected 16650 cells are 2000 mAh

Yup, I've seen some rated even higher than that. I'm just saying a current version of 17670's could do even better.

Maybe be pushing 2500mAh. Or more! And would still fit a stock Surefire.

 

[vicv]

There's a lot of battery sizes that could use a refresh. A 25500 has the same volume of a 21700. So we could have 5000mah c cells. Or 12000mah D cells. A 17670 would be around 3200 mah. But alas this isn't the case

 

[ampdude]

There's a lot of battery sizes that could use a refresh. A 25500 has the same volume of a 21700. So we could have 5000mah c cells. Or 12000mah D cells. A 17670 would be around 3200 mah. But alas this isn't the case

That would be awesome!!!

 

[fivemega]

Nah. My c mag is 30mm diameter. Not the batt.

That's right.
Outside M*g C barrel is about 30mm

Yup, I've seen some rated even higher than that. I'm just saying a current version of 17670's could do even better.

Maybe be pushing 2500mAh. Or more! And would still fit a stock Surefire.

That's right. New 17670 could go higher.

KeepPower protected 16650 cells are rated 2500mAh when recharged to 4.35V but protection circuit cuts off on 4.2V and I can't count on more than 2000mAh
Again, my protected 16650 won't fit in $urefire A2 which is designed for pair of 123A primary.

 

[vicv]

Is it too long? I'm surprised the springs don't just compress a bit more

 

[fivemega]

Is it too long? I'm surprised the springs don't just compress a bit more

AW's protected "C" cells are about 53.5mm long so 7mm longer in 2C M*g
Some flashlights like 2C M*g don't take 107mm long cells (regardless of spring) because tail cap doesn't allow.
Part of 18mm cells can go inside tail cap with more compressed tail spring but 25mm cells cant go inside tail cap at all.