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Old 12-30-2005, 09:35 PM   #1
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Battery ?

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This may be a stupid question but here it is. What is the difference between AA and AAA. I know the AA is physically bigger but if both are 1.2V and have the same Mah rating is it just the size that is different or am i missing something?
Thanks, kevin.
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Old 12-30-2005, 10:20 PM   #2
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Is one NIMH and the other NICAD?
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Old 12-30-2005, 10:45 PM   #3
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You are right, it is just the physical size.

All Nicad and Nimh batteries are rated at the same voltage regardless of the size. (1.2v)

Due to chemistry, a Nimh cell will have about 1.5 times the capacity (MAh) of a similar sized Nicad cell.

Manufacturers pack different amounts and qualities of material inside a cell. The smaller cell may have more reactionable material inside resulting in a higher capacity.

You get what you pay for.
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Old 12-30-2005, 10:56 PM   #4
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Lets assume they are both nicad. I was just wondering about the size's because people are always concerned about the weight of their models and I was trying to figure out why you couldn't build your RX packs with AAA's instead of AA's.
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Old 12-31-2005, 05:29 AM   #5
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Take a AA battery and hook it to a flashlight bulb in series.

Take a AAA battery and hook it the same, run them both side by side on your bench or on a table, and wait...
The answer is in the light, The AA will be brighter, therefore lasts longeur.

You could get away with AAA battery packs, but you could not fly as long without re-charging...
Try it, you'll be surprised by the brightness of your AA when the AAA is almost to a dim nothing yellow light.

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Old 01-01-2006, 03:29 PM   #6
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It's called internal resistance. A smaller cell usually has a higher internal resistance (as a guideline... not a law... tech is always changing). The added internal resistance of the AAA prevents the same current from flowing as the freer AA. Another result of the higher internal resistance is voltage drop... the battery's voltage goes down lower under load if its internal resistnce is higher, which in turn results in even lower current output... so the AAA is actually providing the lightbulb with lower current AND voltage. When you multiply current and voltage you get power, so with lower current and voltage, the AAA is delivering much less power to the lightbulb (measured in watts).

If both batts are rated with the same mAh, then there's a 99% change the AAA is NiMh and the AA is NiCd.

For the ideal RX pack, you want light weight and large capacity and voltage capability (called energy density), all while maintaining a low internal resistance so the pack can give up the current without the voltage dropping. You can go to Sanyo's website and look through their different cell data sheets... they list weight, capacity, and internal resistance. IMHO, the most impressive one out right now is the 1950 NiMh... it can give up around 40 Amps!!! I use these on igniotions in big planes. For the RXs I use LiIon packs... very high energy density.
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