Many of you made know this already (couldn't find anything posted in SurvivalMonkey) but regular household batteries (AAA AA C D 9 volt) can be recharged. I stumbled across a few short articles about it and decided to try it myself. I picked up a simple charger for AA & AAA batteries for a few bucks, and stuck in a few alkaline batteries that were dead and they came back to like. So now I collect batteries that other people were going to discard and charge them up! It's nice not having to keep buying batteries all the time, and it's good for the environment.