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Old Jun 18, 2005, 10:23 PM   #1
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Does anyone make a Lithium Ion Rechargeable AA battery?



Thanks for the help,



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Old Jun 18, 2005, 11:24 PM   #2
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Yes a couple of companies do. You have to get a new charger though as the chargers for NiMH don't work. They come as a package with the charger and are pricey compared to NiMH. They are lighter and more powerful than NiMH and don't share the high self-discharge.
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Old Jun 19, 2005, 12:10 AM   #3
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There are no Li-ion rechargeable AA type batteries. The only ones out there that resemble AA cells are 3.6v per cell and made for special applications or battery packs. The CR-V3 type Li-ion rechargeables can't be used in all cameras that use 2 or 4 AA type batteries unless the battery compartment and the camera's circuitry was made to use them. AA alkalines are 1.5v per cell, NiMH type are 1.2v per cell and the one-use "photo lithium" AA batteries are 1.5v per cell but they are NOT rechargeable.
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Old Jun 19, 2005, 9:24 AM   #4
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To those who replied to my post – Thank You.

Surfing found a battery by Batteries America, which is two AA cells bound together, rated at 2000 mAh at 3.0 Volts. Its part # is P-CR-V3. Steve I think this is what you were referring to in your reply post only these are rated at 3 Volt rather than the 3.6 Volt.

Where they get the "P" from I'm not sue?

This is the closest battery type I have found that may meet my needs. I have several digital cameras that use the AA batteries and have several AM&FM radios, walkmans and a ham radio - handy talkie - that uses the AA also.

Was thinking if I could find single cell AA's in a Lithium Ion battery it may work perfect.

Problem I have is that with the NiMH and NiCd cells there only rated for 1.2 Volts. This will not work with the Ham radio gear – where it needs 1.5 Volts multiplied by 4 Cells to get 6 Volts.

I'm not sure why NiMH and NiCd's are not made to equal the alkaline Voltage unless it's the ratio of the physical size compared to the properties of the chemicals placed in them.

Does anyone know why the NiMH / NiCd are not rated at 1.5 Volts?

Does anyone know why single cell rechargeable Lithium Ion AA batteries rated at 1.5 Volts aren't manufactured?

Thanks again,

We4FM
















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Old Jun 19, 2005, 10:36 AM   #5
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We're getting into Chemistry here. It's a matter of the difference of voltage potentials between metals. It's been awhile since I've taken Chemistry so my information may be a little off.

The human body runs partially of a sodium - potassium reaction. The voltage difference is mere millivolts.

Nickel metal cells functions similarly. The fact is the voltage potentials cannot be changed. I'm assuming Lithium cells are the same. Hmmmmm.....

For more information, goto

http://www.batteryuniversity.com

for some brief explanation of battery technology.

I think I need to re-read this stuff........
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Old Jan 6, 2011, 6:57 PM   #6
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Default Lithium Ion Voltages

All batteries operate by a chemical reaction that caused electrons to flow from one pole to the other. Each pair of chemicals used in the electrodes generate a constant voltage. This voltage is dependent on the elements (chemicals used)

Here is the Electrochemistry for a Lead/Acid battery:

Anode (oxidation):

Cathode (reduction):

This for one cell. If you put several cells in series the voltage is addative.
Thus if you had 1.685 volts for one cell, you would have 13.48 volts for eight cells, as you have on a nominal 12V car battery.

One cell of NiMH yields about 1.2 V etc.
One cell of Li-ion yields about 3.7V

If you need 4 - 1.5V cells in series (6V nominal) to power a device.
You could use 2 pairs of 3.7 Volt Li-ion that would yield 7.4V.
That would be very close to 4 Alkaline batteries in series as 1.6V x 4 = 6.4V

But you would need to rewire the battery compartment if possible to acheive this.
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Old Jan 6, 2011, 7:02 PM   #7
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please don't post in yellow. it's killing me.
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Old Jan 6, 2011, 8:44 PM   #8
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And use a larger font.
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Old Jan 6, 2011, 11:04 PM   #9
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also fr those reading this thread don't post in the same color as the background as several posters have and it looks like a blank post till you run the mouse over the blank space to find text
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Old Jan 7, 2011, 2:29 PM   #10
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Quote:
Originally Posted by Photo 5 View Post
also fr those reading this thread don't post in the same color as the background as several posters have and it looks like a blank post till you run the mouse over the blank space to find text
who's doing that? if it's me, I'm not aware of it. is your background black?
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