EDIT: this is wrong. See posts below.
Well, I made an expensive mistake today. Spent nearly 50 bucks on rechargable batteries and a charger for them, but turns out they don't work with my wiimotes; they refuse to sync, but otherwise appear to operate normally (flashing lights when you push buttons, etc)
So I do a little research on the internet, and reports conflict on what rechargables work for the wiimotes. Some insist Ni-MH or Ni-Cd are the only way to go, while others insist only rechargable alkalines will work.
I think I've discovered the truth: it's not well advertised, but your standard alkaline is rated for 1.5 volts. the rechargables I picked up are rated only 1.2; Milliamp hours (mAH) are irrelevant if they won't put out the voltage you need.

anyone actually use rechargables on their wiimotes? what brand is good? (and puts out 1.5 volts at least?)