I seem to use a lot of AA and AAA batteries, for remotes and my wireless keyboard and mouse and I cannot bring myself to buy batteries that will ultimately be thrown away (after one use).
Rechargeables and a charger cost more, but are well worth it in the long run IMO.
It seems that I replace my mouse batteries (AA) every couple of weeks depending on how much I'm playing games, and the keyboard batteries (AAA) less so.
I have not looked into size D rechargeables so flashlight batteries are the only ones that I've bought in recent memory that are not rechargeable.
Thoughts and comments?