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December 08, 2003
Good Battery Info
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Good Battery Info: (pdf)
Here are some conservative power ratings for good quality alkaline-manganese dioxide batteries available at the local grocery store.
| Battery Type | Capacity (mAh) | Typical Drain |
| D | 12000 | 200 mA |
| C | 6000 | 100 mA |
| AA | 2000 | 50 mA |
| AAA | 1000 | 10 mA |
| N | 650 | 10 mA |
| 9 Volt | 500 | 15 mA |
| 6 Volt Lantern | 11000 | 300 mA |
The battery capacity will be better with lower drain currents. To determine the battery life, divide the capacity by the actual load current to get the hours of life. A circuit that draws 10 ma powered by a 9 volt rectangular battery will operate about 50 hours:
500 mAh /10 mA = 50 hours
And this test suggests that Duracell and EverReady are basically the same, but that store-brands can be much weaker.
I wish I had known this when I was trying to power 2,000 mA motors with 9-volt batteries!
--------Posted by mslaybau at December 8, 2003 11:31 AM
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