I have had good luch with Powerex
I have been using Powerex 2700 mAh NiMH AAs from Thomas Distributing for several years in my digital cameras and flash units. I have 5 sets of 4 batteries, each with its own charger. The chargers are Maha MH-C204W units, also from Thomas Distributing. Thomas usually has some kind of package deal with the charger and batteries and will throw in some cheap but useful plastic battery boxes and a simple battery tester with some combos. As someone else mentioned, it's not unusual for only one battery in a set to fail, so a tester is handy.
However, all my Powerex sets are still going strong. the 3 oldest sets were put in service in 2006. I generally charge all sets every month or two and the sets I plan to shoot with extensively get charged the night before the shoot. The Maha chargers do a programed charge; they complete a fast charge in about an hour, then continue at a low current rate. When the trickle charge is completely done, the batteries will be cool. Cheap chargers that charge at a steady rate until they are unplugged can cook batteries and are said to shorten their life.
My first digital camera, a Minolta Dimage 7, was very fussy about input voltage and would shut down with slightly aged NiMH batteries after a dozen or so shots. These same batteries still take an adequate charge for other uses 6 or 7 years later. My newer digital cameras seem to be much more forgiving and also use less power in general. I don't need to swap out a battery set until I have shot well over 100 pictures. (I don't use a camera's built-in flash but use a separate flash with its own set of 4 Powerex double As. The flash also rarely needs the back-up battery set.
I have had much poorer results from some other battery brands and ther Maha chargers won't work with some of these other batteries.
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