On average use, my main camera depletes its batteries every 2-3 months, which causes an irritating albeit minor expense whenever the batteries need replacing. A few months ago, Dad bought a set of rechargeable AA batteries for my camera; these batteries were more expensive than the standard ones but they would pay for themselves after six months.
The most recent set of standard batteries had already been in my camera for three months when Dad bought the new batteries, and so I assumed I wouldn't have long to wait to use the rechargeable set. A week, perhaps, maybe two? How about three...months?
My camera's standard batteries depleted yesterday, giving them an overall life in the camera of around six months. I was not expecting the batteries to last for that long, especially since I have been taking a great amount of pictures with the camera in that timeframe despite the weather. On the one occasion when I wanted batteries to drain as quickly as possible, they kept on going!
When I finally tested the rechargeable batteries in the camera today, they worked exactly the same as the normal ones did. I'm looking forward to seeing how long they last!