Whats the difference Between 18650 and AA

[mustang51]

Whats the difference between 18650 batteries and regular AA batteries? :anyone:

 

[rhd]

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)

 

[mustang51]

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!:thanks:

 

[rhd]

Here, this may help:

 

[lasersbee]

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!:thanks:

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....:beer:

Jerry

 

[BShanahan14rulz]

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.

 

[rhd]

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)

 

[benmwv]

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

 

[Vextor]

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

 

[LarryDFW]

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.

LarryDFW