For example, a tv remote needing two AA batteries instead of four AAA batteries.
In: 2
They balance:
1. What voltage is required to get the gadget to work.
2. What is a reasonable expected time between replacing batteries
3. How big a device will users tolerate.
The main difference between your standard 1.5V AA VS AAA batteries is physical size and amount of energy. The voltage is the same.
So if you need 3V to get the gadget to run your choice is whether to use 2 AAA, 2 AA, 2 C or 2D. These will each combine to churn out 3V to make the device run, and will do so for progressively longer.
If they want the device as small as possible they’ll use AAA batteries, at the trade off of more frequent battery changes, if they are willing to go with a slightly bulkier remote they’ll use AA. A remote that’ll take C or D batteries should last a long time, but would be way bigger than tolerated by most customers so they are unlikely to choose these unless there’s a serious reason to.
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