Disposable batteries obviously increase pollution and use up the Earth’s resources, but there’s really very little need for them. Rechargeable batteries are so good these days that it must actually be very close to the point where disposable batteries should be banned. I’ve been using rechargeable batteries for almost everything for 3+ years now, and they work well. There’s no need for disposable batteries.
First experience with rechargeable batteries
The first time I really looked at using rechargeable batteries was to power the external flash unit of a new Canon camera that I bought. The external flash unit took four AA batteries and I did a bit of research to see what professional photographers used for this purpose and I came across Eneloop batteries (note that I’m not deliberately promoting this type of battery – it’s just what I have experience with – there must be other good types of rechargeable battery as well). These worked great for the camera flash and, I learned over time, also seemed to work well on everything else.