There are these things for charging.
Or for carrying around if on a longer anything. I just like to have one for the MP3 player because I get frustrated if the battery goes when I'm in the middle of a walk. With the right adapter they'll do for anything. Mine is identical to the one pictured but was $20.
Well, that answers all the questions I have. Can't think of a reason to not get one. I can only hope I'm clever enough to utilize it.
My next budget cycle. As ever, my ongoing thanks.
Bowser