That reminds me, I have one of those hanging on a peg over my desk still that needs a battery replacement. One of these days I'll get around to it. These days aside from the novelty factor it's so much easier to just throw a pair of AA's into one of the Batarang OG GBA's or bung a game into the Gameboy Player.
Don't get me started on the damn shoulder buttons. The DS Lites were also notorious for breaking those via cracking the switches clean off the board just with normal use. I forget how many of those I had to painstakingly resolder. Which, in retrospect, I did with sub-optimal tools back when I was broke.