Three days of semi constant play and the batts are dead, was about 20 hours of game play. When your wii is sleeping, it doesn't drain batteries. After a while the wiimote doesn't detect motion or button use and shuts itself off. It does the same when you turn off your wii. Pressing a button will turn it on and set the lights blinking as it searches for a wii.
Yeah, nintendo slipped up on the batteries. With constant play, you'll have to keep buying batteries, which adds up. I don't know why they didn't do the same as ps3 or xbox 360 and allow you to charge your remote in some way, by like connecting to the system while it's off or something. Well, regardless, I got myself a 2hour high capcity batt charger, and I have enough batteries to switch out through my remotes, even if they all went dead at once. Cost me 16 bucks for 4 bats and the charger, which came together. I bought 12 more batteres for about 12ish dollars? Maybe it was 15 I forget.