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Old 06-23-2011, 03:09 AM #1
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Question Whats the difference Between 18650 and AA

Whats the difference between 18650 batteries and regular AA batteries?


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Old 06-23-2011, 03:22 AM #2
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Default Re: Whats the difference Between 18650 and AA

They're entirely different battery sizes.
AA = 14500
18650 = 18650 (so 4mm thicker, and 15mm longer)

Also, 18650 generally implies lithium-ion 3.6V chemistry or LiFePo4 3.0/3.2V chemistry. AA doesn't really imply a chemistry at all (though generally it would be nimh, alkaline, etc - really anything producing 1.2 or 1.5V)
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Last edited by rhd; 06-23-2011 at 03:23 AM.
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Old 06-23-2011, 03:32 AM #3
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Default Re: Whats the difference Between 18650 and AA

I've only seen 18650 batteries in pictures and they looked pretty much the same in the pictures so I didn't know the difference. but thanks for answering my question!
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Old 06-23-2011, 04:42 AM #4
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Default Re: Whats the difference Between 18650 and AA

Here, this may help:
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Old 06-23-2011, 11:09 AM #5
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Default Re: Whats the difference Between 18650 and AA

Quote:
Originally Posted by mustang51 View Post
I've only seen 18650 batteries in pictures and they looked pretty much the same in the pictures so I didn't know the difference. but thanks for answering my question!
Some times reading the label on the battery will
give you a good idea of the Voltage and on some
batteries the capacity (mAh)...

@ RHD...
don't forget the 1.5V AA cells that use the old
Carbon/Zinc chemistry....

Jerry
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Old 06-24-2011, 04:13 PM #6
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Default Re: Whats the difference Between 18650 and AA

18650 < most common Li-Ion cell size
14500 < AA-sized Li-Ion cell
10440 < AAA-sized Li-Ion cell

RHD implied this, but it wasn't explicitly stated in this thread, so here you go:
XXYYZ - Li-Ion cell naming convention
-XX = diameter of the cell in mm
-YY = length of the cell in mm
-Z = almost always 0, which designates a cylindrical cell. Dunno what other values for Z might show up.

Last edited by BShanahan14rulz; 06-24-2011 at 04:13 PM.
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Old 06-24-2011, 04:27 PM #7
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Default Re: Whats the difference Between 18650 and AA

Often the Z value is treated as a third digit of the Y designation. Why fractional millimeters are necessary, I have no idea. Look at 15266 batteries (CR2)
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Old 06-25-2011, 05:20 PM #8
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Default Re: Whats the difference Between 18650 and AA

The first two are width in mm, the rest are length in mm with one decimal place. The one decimal place helps for naming button cells.
Ex.
Cr2032= 20mm wide, 3.2mm tall
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Old 06-26-2011, 06:26 PM #9
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Default Re: Whats the difference Between 18650 and AA

Even with same numbers, there are differences in size or endings that can result your battery not suitable for the purpose:



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Old 06-28-2011, 01:17 AM #10
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Default Re: Whats the difference Between 18650 and AA

Here is a chart for comparing different cell types:

Battery Type Cost $/Wh . Wh/kg . Joules/kg
Lead-acid . . . . $0.17 . . . 41 . . . 146,000
Alkaline type . . $0.19 . . . 110 . . . 400,000
Carbon-zinc . . . $0.31 . . . 36 . . . 130,000
NiMH. . . . . . . . $0.99 . . . 95 . . . 340,000
NiCad . . . . . . . $1.50 . . . 39 . . . 140,000
Lithium-ion . . . $0.47 . . . 128 . . . 460,000

These are high volume prices for large quantities.

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