I have had these AAA batteries for a couple of years. I use them for my mp3 player, my Sony sports radio, and my Mighty Bright clip-on light.
These give me about as much power as the regular Duracell Coppertop AAA alkaline batteries.
- Capacity
Although not mentioned in the product description, the capacity of these batteries is 1000 mAH. Duracell also makes these
Pre-Charged 1000 mAH AAA Rechargeable Batteries (1000 mAH is the highest capapcity of AAA rechargeable batteries that Duracell makes as of this writing).
- Battery Life
I'm very satisfied with the battery life of these batteries. I frequently use my Might Bright light to read. These Duracell batteries give me 15-20 hours of light before my the light grows noticeably dimmer. After that, I can still squeeze some juice out of them to get a few more hours of usable light. And on my antiquated Cowon iAUDIO 4 player, I get about 10 hours from a single Duracell AAA Rechargeable battery!
I have both an Energizer and a Duracell battery charger. These batteries perform spectacularly no matter which charger I use to charge them.
- Pre-Charged Alternative
Whenever you're in a pinch and need some batteries (say you're out vacationing), instead of buying alkaline batteries, I'd also really recommend that you try these Pre-Charged Duracell Batteries. They're ready to go right out of the package, and after they have been depleted, you can pop them in your charger to charge them right up and reuse them again.
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These Duracell AAA Rechargeable Batteries last a long time in my medium-drain devices. I'm more than satisfied with the performance on these Duracell Rechargeable Batteries.