Young padowans, I use rechargeable batteries since 1988, because I used a lot of players (the latter, a Panasonic 1996 with Dolby C, still works!). I tried the first Nickel-Cadmium Mazda, Sony and supermarket brands, NiMH Sony, Omron, TKA, and whether microphones (AAA, formerly LR3) cute (AA, LR6) or 9V (6F22 ), Duracell and Varta have always been above the lot ... and remain. Whether photography, radio controls, batteries for Pod and Effect Pedals, wireless PC peripherals, Duracell remains my preference. Moreover, they do not leak, and that, in the long term. The specification is drastic environmental loads; performance and workmanship are first class (this range is still manufactured in Japan). As regards the filler, they do not undergo the memory effect, which is an innovation. To see the long term. Those who follow me know that I update my comments even two years later. If you use high-power devices such flashes (yes, it still exists), radio-control (it still exists, there he has a toy that will not be ..?), Wireless keyboards I recommend the 2400 mAh batteries. Otherwise the 1800-2000 mAh widely enough! Bad luck, I received a non pre-loaded batch. Given the production, I hope it's the needle in the haystack. I put them in charge on a Duracell charger that gives full satisfaction (see my review), I will tell you how fast it loads, and how long they last. 06/12 // 13: 4h charge on Duracell AA and AAA charger sufficed. They have so far given a good hour on a very high consumption of appliance (pod). 03/18/2014: very well take the load on a guitar pod (up to 6h cumulated). Also agree for a slave or master-type flash Cobra.