why aren't rechargebles the same shape and size?
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Marduke
Flashaholic
The cell itself usually is, but the protection circuit adds length. Quality cells are better than cheapies in keeping within tolerances.
Illum
Flashaholic
they are the same shape and sizes, by ANSI standards, and always will be 
the reason for the multitude of sizes and volumes is because the original design of these cells are based on certain commercial demands in which they can suffice in a limited space set aside from the product designer of that particular product.
If you will notice the known and familiar 18650 LiCoO2 lithium secondary cell many of us like to use in our flashlights. 18650 was originally developed for the laptop battery industry and later integrated as the mainstream laptop batteries. Only a handful of notebooks, like my Thinkpad X32 uses the smaller 17670s.
Overtime of course, there are a few variations that are weeded out in the development of new cells either because of performance issues or simply failed the cost analysis of the producers. But the main dimensions still exist 10440, 14500, 16340, 17500, 17670, 18500, 18650, etc.
On the forum we have the ability to try out lithium secondaries in lights that otherwise would only accept primaries in the face of general consumers. Different batteries are made for different purposes, so of course they wouldn't be exactly the same. .
Flat top and button top differences only exist that button tops by design may be singularly installed or operated while flat top batteries are designed to be built into packs, or arrays, in a specified series parallel [or just series] configuration.
Am I helping you any or am I going way off on a tangent here...could you make your question clearer as in using definite objects of comparison?
Primaries meant any single use batteries, whether it be LiFeS2 [Energizer lithium], LiMnO2[CR123A] or 2MnO2[Alkaline].
rechargeables that match these in terms of dimension could refer to [LiCoO2] 14500 (Lithium-ion AA), 16340 (RCR123A), 17670 (2xCR123A)
the reason for the multitude of sizes and volumes is because the original design of these cells are based on certain commercial demands in which they can suffice in a limited space set aside from the product designer of that particular product.
If you will notice the known and familiar 18650 LiCoO2 lithium secondary cell many of us like to use in our flashlights. 18650 was originally developed for the laptop battery industry and later integrated as the mainstream laptop batteries. Only a handful of notebooks, like my Thinkpad X32 uses the smaller 17670s.
Overtime of course, there are a few variations that are weeded out in the development of new cells either because of performance issues or simply failed the cost analysis of the producers. But the main dimensions still exist 10440, 14500, 16340, 17500, 17670, 18500, 18650, etc.
On the forum we have the ability to try out lithium secondaries in lights that otherwise would only accept primaries in the face of general consumers. Different batteries are made for different purposes, so of course they wouldn't be exactly the same. .
Flat top and button top differences only exist that button tops by design may be singularly installed or operated while flat top batteries are designed to be built into packs, or arrays, in a specified series parallel [or just series] configuration.
Am I helping you any or am I going way off on a tangent here...could you make your question clearer as in using definite objects of comparison?
Primaries meant any single use batteries, whether it be LiFeS2 [Energizer lithium], LiMnO2[CR123A] or 2MnO2[Alkaline].
rechargeables that match these in terms of dimension could refer to [LiCoO2] 14500 (Lithium-ion AA), 16340 (RCR123A), 17670 (2xCR123A)
Illum
Flashaholic
well, dimensionally both the alkaline AAA and the lithium AAA follows the ANSI dimensions because that's what was assigned for "AAA"
Now the application of an alkaline AAA is not necessarily the same in terms of output compared to the "10440" lithium battery. An AAA alkaline cell provides power for low power consumer devices, output is ~1.5OCV 900mah while the "10440" is 3.7CCV 340mah.
In most cases, there's no reason why lithiums and alkalines should share the same applications. They are dimensionally the same as they confirm the "if it fits it works" theory...so I can understand where your coming from
While dimensionally the same, they are neither interchangeable nor by design compatible. I'm not sure why the 10440 was created since most of the smaller battery packs consists of flat-top NiCd's or NiMH's welded together and much more safer and stable than applying lithium ions.
An interesting thread has been going on with the mach3 razor...if this sort of things don't stop we'll be seeing remote controls and quartz clocks burning out because people think sensitive electronics such as these have sufficient overhead in its circuitry to allow you to experiment with them without damage
.
Flashlights we've been seeing a portion of which has now been designed around its battery rather than the other way around. While the true application of the 10440 is unknown, I can neither confirm nor deny that it was made for flashlights:laughing:
Now the application of an alkaline AAA is not necessarily the same in terms of output compared to the "10440" lithium battery. An AAA alkaline cell provides power for low power consumer devices, output is ~1.5OCV 900mah while the "10440" is 3.7CCV 340mah.
In most cases, there's no reason why lithiums and alkalines should share the same applications. They are dimensionally the same as they confirm the "if it fits it works" theory...so I can understand where your coming from
While dimensionally the same, they are neither interchangeable nor by design compatible. I'm not sure why the 10440 was created since most of the smaller battery packs consists of flat-top NiCd's or NiMH's welded together and much more safer and stable than applying lithium ions.
An interesting thread has been going on with the mach3 razor...if this sort of things don't stop we'll be seeing remote controls and quartz clocks burning out because people think sensitive electronics such as these have sufficient overhead in its circuitry to allow you to experiment with them without damage
.
Flashlights we've been seeing a portion of which has now been designed around its battery rather than the other way around. While the true application of the 10440 is unknown, I can neither confirm nor deny that it was made for flashlights:laughing:
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rizky_p
Flashlight Enthusiast
i heard someone in forum mentioned(i cant recalled who) that 18650 lithium was meant to replace Similar sized(F size?) Nicd-Nimh in laptop battery pack.
rmteo
Flashlight Enthusiast
Actually, the 18650 is similar in size to an A cell:
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=2260
An F cell is much larger at 33x91mm - you could call it a long or 1.5D.
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=1243
Illum
Flashaholic
I guess I wasn't born yet when they were using F cells in laptops?
oo::huh2: gee...nowadays the only traces of F cells are found in 6V lantern batteries
Just for the record AAA and 1/3A are not the same.
AAA = 10.5x44.5mm
1/3A = 17x21mm
http://www.powerstream.com/Size.htm
Illum
Flashaholic
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