Batteries for a cordless mouse

[Peaches]

I'm the first one to admit that sometimes I become complacent and I'm happy using whatever antiquated system I have, but I finally broke down and got rid of the 5+ year old clicking IBM keyboard and a mouse that they no longer make and bought cordless ones.

I've had them hooked up about 2 weeks and this AM I got a message that my mouse's batteries were "dangerously low". I've continued to use the mouse all day, so apparently I was lied to, but if I'm going to use batteries that fast, I thought I might look into rechargeable ones.

Again, I'm a little slow, and the last time I used the rechargeable ones was 10+ years ago. They were yellow and didn't hold their power very long and weren't real powerful when they WERE hot.

I'm assuming advances have been made since then Any recommendations? Are there more than one type of rechargeable and if so, is one more suited to what I need it for? Granted, I still have 42 batteries left in the Costco pack, but this is for future reference.

Thanks!