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The "power" claims for AA and 9V don't seem right. A 9V has the same current draw as as AA?
by coin 13y ago
The "power" claims for AA and 9V don't seem right. A 9V has the same current draw as as AA?
- TaylorAlexander 13y agoSounds right, 9v batteries aren't about current, never were. They are about voltage, that's even why they have the voltage in the name unlike basically every other kind of battery. Inside though, they're just coin cells in rolls. Cells are 1.5v each, so you need a stack of them to get to 9v. You wouldn't expect a stack of coin cells to put out a lot of current would you? I think a lot of people think voltage means power, so the 9 volt battery probably sounds much more powerful than a 1.5v AA, but they don't realize the 9v has a bunch of smaller cells and the internal resistance is a lot higher, reducing the current output capabilities. I had a guy tell me one time I should hop up the strength of my walking robot by replacing my 6 AA cells with a 9v. :)
- sliverstorm 13y agoAnd you could have, if the AA's were in parallel!
- sbierwagen 13y agoMost 9V batteries are just six AAAA (nearly) cells wired in series. It should actually have less current capacity than a AA. https://en.wikipedia.org/wiki/9v_battery https://en.wikipedia.org/wiki/9v_battery