If anyone is not aware of this, take a look:
http://www.rayovac.com/15minutes/info.html

Yesterday, I went to Walgreens and bought the charger (the 4 battery model), which brings 2 AA batteries. The price was about $35.00.
When I got home, I put the batteries in the charger, and plugged it in. Immediately a small fan started, so you can guess how hot the charger and batteries would get without it.
To my suprise, 14 minutes later, both green led lights turned off, meaning that the batteries were fully charged
Indeed, they were, because I put it in my daughter's portable MP3 player and "Full Battery" icon was displayed. Today, she is still using the player, so this is a real technological breakthrough. Now I'll save A LOT on batteries
BTW, the batteries can be recharged up to 1,000 times
Take a look at the link above, where all the details are explained.

-kwag

I've had the 15 minute Rayovac charger for about 2 months. I only have the 2 battery version. I bought 4 extra AA and 4 extra AAA and replaced them in my wireless keyboard and mouse, as well a couple of remote controls around the house.

No more single use batteries for me.

Greg

I did that too Same here

-kwag