Recharging your batteries

Do you get through an endless supply of batteries?  We certainly seem to in our house.  About a year ago, I was just about to pick up yet another pack of AAs when I noticed just below it that you could buy a pack of rechargeable batteries and a charger for just under twice the price of one pack of batteries, so I decided to swap to that.  Now when my mouse is squeaking for new batteries I use the rechargeable ones.  I realised that I’ve saved myself about £20 in just a year.  Not sure why I didn’t think of it years ago!