Quote:
Originally Posted by Elfwreck
The earliest Kindles had an SD slot. I can't remember if it went away at K2 or K3.
And while a triple-A battery is thicker than several of the current e-ink readers and some tablets, it's hardly an overwhelming size. Most portable hard drives are big enough to allow for AAA batteries (if they had any use for batteries), and that's not too thick for a portable book/library. AAA's are tiny. (And short-lived, which is the problem. But they could power e-ink for quite a while.)
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I have several devices that have one end slightly larger in order to put in a battery pack or 2 or more small batteries. The triple A are not the smallest before you get to the button batteries.
The neatest devices take either rechargeable or throwaway batteries.
The small hiking GPS units have replaceable throwaway batteries. Will go to about 18 hours always on usually.
Again I will show my age and talk about some of the first cell phones. The old Motorola flip phones that
used LEDs rather than LCDs. The flip part was the keyboard.
They used a lot of power when on, so you needed a lot of battery. The whole back of the phone was a rechargeable battery that detached. You would have several backs in the charger at night. One on the phone and a separate one. Then you carried the extra back with you.
You could buy extra backs, of different sizes and capacities for when you were away from your charger.
You could also buy a back that would take regular throwaway alkaline batteries. You would just plug the new batteries in and you were ready to go.
I still have that phone along with some antique cameras, watches, etc.