I went to BigLots and picked up a $5.00 AC universal adapter, turned it to 3V, and put the 9V leads on the battery leads on the WiiMote, using balled-up tinfoil to make contact. I used a couple of confiscated erasers I’d harked from my students (hey, if they play with it in class, it’s a toy, and it’s mine!) to maintain pressure of the 9V leads to the battery leads. I no longer have to climb on a table and check the batteries every day anymore! It’s wonderful.
Another thing I’m sick of is swapping batteries in my IR pens. I don’t want to use USB cables. I tried putting a rechargeable battery in the wiipen and using bent paper-clips to run from the charger leads to the battery nodes through some holes I’d drilled in the case. It worked, but the batteries I was using are way crappy so it didn’t work well. I’m sure it will work well once I get over being too cheap to spring for some new rechargeable AAs.