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Difference between 1.2v and 1.5v AA's

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Old 11-12-2006, 06:46 PM
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asinla
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Default Difference between 1.2v and 1.5v AA's

Just a quick question I'm sure someone here will have the answer to.

I recently purchased some AA and AAA rechargeables to use in my RTF tx's. I also purchased a Picco Z heli which charges off the batts in the tx. I noticed that the NiMH rechargeable batts were only available in 1.2v. I know Alkaline batts are 1.5v.

Is there any loss of performance by using the 1.2v batts and how come they don't make 1.5v NiMH rechargeables??

Thanks.

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Old 11-12-2006, 07:49 PM
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Default RE: Difference between 1.2v and 1.5v AA's

Nicad and NiMh rechargeablecells have a nominal voltage of 1.2 V. Fully charged they measure about 1.4 V. Alkaline and other dry cells have a voltage of 1.5 when fresh.

You can use them interchangably in your TX. Either will provide plenty of power.

The difference in voltage of a fresh dry cell and a fully charged nickel based cell is a characteristic of the chemistries. It wasn't planned that way, it's just the way it is.

Hope this helps,
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Old 11-13-2006, 04:39 PM
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Default RE: Difference between 1.2v and 1.5v AA's


Quote:
ORIGINAL: Flying Geezer

Nicad and NiMh rechargeablecells have a nominal voltage of 1.2 V. Fully charged they measure about 1.4 V. Alkaline and other dry cells have a voltage of 1.5 when fresh. But under any significant load they will drop to 1.2 volts or so.

You can use them interchangably in your TX. Either will provide plenty of power. And the alkaline cells (dry cells)have a much more sloping discharge than either the Ni-Cd or Ni-Mh so you can check how much you have left by simply measuring the voltage (or keeping an eye on your transmitter meter if you have one)

The difference in voltage of a fresh dry cell and a fully charged nickel based cell is a characteristic of the chemistries. It wasn't planned that way, it's just the way it is.

Hope this helps,
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Old 11-13-2006, 07:37 PM
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Default RE: Difference between 1.2v and 1.5v AA's

Thanks so much for that concise and precise explanation. It does make a lot of sense actually now that I look at it like that.

Thanks again

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