i got a panasonic rechargable thing to pull into the wall and batteries for 20$ at a wholesale club... it charges both aaa and aa batteries, came with 4 aaa and 2 aa, and i bought more aaa, since thats what my gps uses (my digital camera uses aaa so it all worked out) whenever i put charged batteries into my gps it says they only have 3/4 power, but i bring back ups and it is still so much cheaper than buying new batteries