I bought a 48 pack of batteries from Sams Club for 8.97 Thats going to last me along damn time without worrying about charging my wiimote before I can play but to each their own
I have a ton of Nimh AA's because I use them for everything (Mp3 Player, digital camera, beard trimmer, etc). Mine have probably lasted just under 30 hours. Thus, you buy a 4 pack and charge the dead set as soon as you put a fresh set in the remote. That way you'll always have batteries, even if it takes 6 hours to charge.
man get got rechargable batteries with the highest mAh (milli-amp a hour) they last longer, i got 4 2200mAh for digicam, and a recharger, will be right beside my wii when i get it,