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Because what is in a 9 volt is 6 AAAA batteries. They are smaller than even an AAA battery. Only thing I know that uses them is some of the surface drawing pens
by birdman3131 2y ago
Because what is in a 9 volt is 6 AAAA batteries. They are smaller than even an AAA battery. Only thing I know that uses them is some of the surface drawing pens and the like.
That said if you need 9 volts ask a church. I know we would gladly hand you a box of half full ones as you have to pull them out of the wireless mics before they die. And older Shure mics are 9 volt.
- ssl-3 2y agoPerhaps interestingly, some 9V batteries (Varta comes to mind) have a stack of cells with rectangular cross section instead that of a cylinder (like AAAA), which suggests an improvement in energy density.
- computator 2y ago> Because what is in a 9 volt is 6 AAAA But then the question would shift to: Why wouldn’t a AAAA cell have the same energy density of a AA cell? Remember that the argument is about energy density, not total energy. By the way, I think that fsh’s reply is a convincing answer: it’s the extra packaging that kills the density.
- DanTheManPR 2y agoThe current collector also takes up relatively more volume, on top of the packaging (the wall thickness would be the same, and it's not a trivial part of the volume of small cell batteries).