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?
In: 7
Voltage is only one characteristic of a power supply.
Two other really important ones are max current (how hard it has to work to turn the wheels) and energy storage (how long it can last before you need to replenish it).
9V battery has relatively small max current and energy storage. It’s mainly for low-power applications.
A toy probably has higher power requirements and also needs to last longer between battery changes.
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