nominally any location where you would use the equivalent size expendable battery.
Only batteries that are marked "Rechargeable" are rechargeable. Are others are single use.
I would strongly suggest the use of rechargeable batteries over conventional batteries. Non rechargeable batteries could "explode" during recharging. Any rechargeable battery will work if they are the same voltage.
Getting rechargeable batteries for cameras will depend upon your camera. Depending on your camera you may be required to use a rechargeable battery for your camera.
because it is rechargeable
There are some rechargeable portable DVD players where you can use rechargeable batteries, they cannot be used in every portable DVD player because at some point the batteries start to slow down.
There are many hearing aids that do not use rechargeable batteries. There are a few out there that do, but you need to make sure you are buying a specific brand.
No
I'm thinking you can
Cadmium
Because you can use them multiple times.
Duracell offers good quality and easy to use rechargeable batteries. There are generic brands of rechargeable batteries out there but they are often unreliable and wear out very quickly.
You can purchase rechargeable batteries pretty much anywhere. This is because they are becoming easier to use and a better economical choice for the world.