I had a toy when I was a kid that took 6 AA batteries. Now I know that means it wanted around a 9V input. But why did it take 6AAs instead of one 9V? The 9V would’ve been smaller and lighter, wouldn’t that have let them make a smaller battery compartment and save on manufacturing costs?
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>The 9V would’ve been smaller and lighter, wouldn’t that have let them make a smaller battery compartment and save on manufacturing costs?
The 9V is only good for high voltage low current applications, it won’t last long if you start pulling a sizable amount of current from it
A 9V battery is effectively 6 AAAA cells in a package, they’re really skinny batteries and can’t provide much current. A 9V only has a capacity of around 560 mAh compared to a standard AA battery at 2700 mAh so 6 AA batteries will last around 5x longer than a 9V under low load and significantly longer under higher loads.
This is the same reason that flashlights use C or D cells instead of just AA batteries in series, the AA cells cannot support the power draw for very long and will die much quicker than you’d expect
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