Energy Density of 9V battery vs. AA batteries
Previously I wrote up why the 9V battery sucks. As I thought more about that post, I realized, I never explained how much energy is in a 9 V battery versus say a couple of AA …
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9V Batteries Suck -- And why you shouldn't use them.
Smoke detectors beep when their backup battery dies, which always seems to occur in the middle of the night (at least for me.) These backup batteries are usually a small …
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