When "18650" is No Longer 18mm Wide by 65mm Long—An Issue for Anyone Else...?

LEDAdd1ct

Flashlight Enthusiast
Joined
Jul 4, 2007
Messages
3,557
Location
Hudson Valley
When "18650" is No Longer 18mm Wide by 65mm Long—An Issue for Anyone Else...?

Well, it was bound to happen. When is the last time an 18650 cell was really 18mm wide and 65mm tall?

Two protected "18650" 3400mAh cells arrived yesterday, and will not fit in most of my lights,
and definitely not in my bored Surefire C3 with one cell extender, where I intended to use them with a P90.

I'll put them to use in a hotwire, but the nature of this thread is an open question:

Who else is having trouble with "18650" cells that are now straying far away from their nominal specifications?

It's a neat cell and great format, but as technology progresses, are they just going to get fatter and taller as we go?
 
Last edited:

Erzengel

Enlightened
Joined
Jun 29, 2007
Messages
296
Location
Germany
Re: When "18650" is No Longer 18650...An Issue for Anyone Else...?

The nominal specifications apply only to the basic unprotected cell. Protection circuits, button tops, the second layer of shrink wrap and the label add some size to the cells.
 

LEDAdd1ct

Flashlight Enthusiast
Joined
Jul 4, 2007
Messages
3,557
Location
Hudson Valley
Re: When "18650" is No Longer 18650...An Issue for Anyone Else...?

While this is true in the abstract, the protection circuits, button tops, second layer of shrink wrap and label were adding some size to the 2200mAh cells, the 2400mAh cells, the 2600mAh cells, the 2900mAh cells, the 3100mAh cells...while the nominal dimensions of the bare cell continued to grow in size.

If you stand a 2200mAh cell beside a 3400mAh cell, you will definitely notice a major increase in the volume of the cell, unaccounted for by the addition of protection circuits, button tops, layers of shrinks wrap, etc. alone.
 

Shadowww

Banned
Joined
Dec 26, 2011
Messages
879
Location
Northern Europe
Re: When "18650" is No Longer 18650...An Issue for Anyone Else...?

If you stand a actual unprotected 2200mAh cell beside a unprotected 3400mAh cell, you'll see they have same dimensions.
 

lightdelight

Newly Enlightened
Joined
Dec 7, 2009
Messages
90
Re: When "18650" is No Longer 18650...An Issue for Anyone Else...?

Yes it is an issue. Very important to know the inner dimensions of the light and the dimensions of the cell. Then jam in the biggest one that fits. I have been using HKJ's reviews to decide which to get. Can I ask which cells you just got?
 

THE_dAY

Flashlight Enthusiast
Joined
Nov 28, 2003
Messages
1,820
Location
sfv, california
Re: When "18650" is No Longer 18650...An Issue for Anyone Else...?

So what's the 18650 brand that doesn't fit? This could help others.

Was it the thickness or the length that made them not fit?

The smallest protected 3400 so far are the Eagletac according to HKJ's site.
 

LEDAdd1ct

Flashlight Enthusiast
Joined
Jul 4, 2007
Messages
3,557
Location
Hudson Valley
Re: When "18650" is No Longer 18650...An Issue for Anyone Else...?

Gentlemen, thank you for substantiating the genesis of this thread.

I knew someone had posted those length and width dimensions somewhere; I should have realized it was our own very fine HKJ.

I also knew that my direct experience with 18650 cells varying very noticeably in width and length was not one in isolation.

The protected 3400mAh cell that did not fit my bored Oveready Surefire C3 with one cell extender was labeled and sold by Orbtronic.
 

THE_dAY

Flashlight Enthusiast
Joined
Nov 28, 2003
Messages
1,820
Location
sfv, california
Re: When "18650" is No Longer 18650...An Issue for Anyone Else...?

You are absolutely right though, I hope they stop getting fatter and longer.

The "18650" issue only became an issue once the cell stopped fitting into the light and I think that started with some of the fatter 3100 and now with the even fatter 3400.

IIRC, next year or so there will be the 4000mAh 18650 cell and if things go as they are that cell probably wont fit into any light.

Hopefully manufacturers can start opening up the inner diameter of their flashlights a little more.
Also the people that add the protection circuits and shrink wrap can find better ways to not add the extra bulk.

As for your C3, Oveready bores to 18.65mm.
I would recommend the Eagletac 3400 since it's the thinnest (18.4mm) and shortest (68.3mm) 3400 cell so far.
 

Norm

Retired Administrator
Joined
Jun 13, 2006
Messages
9,512
Location
Australia
Re: When "18650" is No Longer 18650...An Issue for Anyone Else...?

This isn't just happening with 18650s I recently bought some LSD batteries from Aldi and they are too big for some lights as well as some of things that use AAs.

Norm
 

Changchung

Flashlight Enthusiast
Joined
Oct 2, 2005
Messages
2,167
Location
Where the night is too short...
When "18650" is No Longer 18mm Wide by 65mm Long—An Issue for Anyone Else...?

The same here with a pair of intl-outdoor protected 3400mha panasonic inside...

Just my ultrafire wf-501b can take it.


Sent from my phone with camera with flash and internet on it... :D
 

ElectronGuru

Flashaholic
Joined
Aug 18, 2007
Messages
6,055
Location
Oregon
Re: When "18650" is No Longer 18mm Wide by 65mm Long—An Issue for Anyone Else...?

Testing 18650/3400's from AW, they fit bored bodies, etc just fine.
 

jasonck08

Flashlight Enthusiast
Joined
Sep 16, 2007
Messages
1,516
Location
Redding, CA
Re: When "18650" is No Longer 18mm Wide by 65mm Long—An Issue for Anyone Else...?

Some companies double heatshrink their cells, so they are extra wide. Other QA issues I've seen such as off centered PCB's also are a problem with some of the budget cells.

All 18650 bare cells are within a couple tenths of a mm in width and length from each other. So it really comes down to the assembly process, heatshrink, nickle strip, PCB size and if its centered etc.
 

Norm

Retired Administrator
Joined
Jun 13, 2006
Messages
9,512
Location
Australia
Re: When "18650" is No Longer 18mm Wide by 65mm Long—An Issue for Anyone Else...?

I had to remove the silver label from a Keeppower 3100mAh 18650 to fit a Malkoff MD2.

Norm
 

Streamer

Enlightened
Joined
Feb 23, 2007
Messages
509
Location
Behind The Lamp
Re: When "18650" is No Longer 18mm Wide by 65mm Long—An Issue for Anyone Else...?

I ordered unprotected cells on my last order for the reasons above... I won't be using them in multiples. And I do keep voltages in check for sure.
 

tobrien

Flashlight Enthusiast
Joined
Dec 16, 2005
Messages
4,861
Location
Georgia Highway 441
Re: When "18650" is No Longer 18mm Wide by 65mm Long—An Issue for Anyone Else...?

i'm glad i got linked to this thread, i was wondering too
 

ledmitter_nli

Flashlight Enthusiast
Joined
Jun 4, 2012
Messages
1,433
Anyone feel Panasonic shot themselves in the foot with 3400mAh 18650 being 70mm long?

I ordered a bunch of the protected NCR18650B's and they are either too TIGHT, or too long for my chargers and lights.

And the ones that do barely fit my lights have bottoms pressed in like a dimple. These won't last long.
 

Norm

Retired Administrator
Joined
Jun 13, 2006
Messages
9,512
Location
Australia
Re: Anyone feel Panasonic shot themselves in the foot with 3400mAh 18650 being 70mm l

I ordered a bunch of the protected NCR18650B's and they are either too TIGHT, or too long for my chargers and lights.

And the ones that do barely fit my lights have bottoms pressed in like a dimple. These won't last long.
Panasonic isn't responsible for the cells being that long, the company who added the protection circuits are.
They're tight because of the added layer of heatshrink.

Panasonic have noting to do with any of the above.

Norm
 

Yoda4561

Flashlight Enthusiast
Joined
Jan 22, 2007
Messages
1,265
Location
Florida, U.S.A.
Re: Anyone feel Panasonic shot themselves in the foot with 3400mAh 18650 being 70mm l

Protip: Panasonic doesn't give two farts about their cells being used in aftermarket charger and flashlight bodies. In fact I'd guess they would frown upon it if you brought the idea up with their lawyers.
 
Top