So I was at Walmart today (buying SMB Wii) and I came across an Energizer induction charger for 4 wiimotes:
I know that's for 2, but the one I saw supported 4. It also comes with 4 rechargeable battery packs. Has anyone used this? It seems like it would be the most convenient charger out there, since you don't have to take the covers off. Right now I use rechargeables that charge through the USB ports, but they're the cheap ones from China and they only last a few hours.