I have been using these for a while. Good value for money and using these is more environment friendly(supposedly). It is difficult to find these in stores, can order it online only. Is it because of the alkaline battery maker's lobbying/deal with stores? Less profit for stores? Consumers don't care, not worth the hassle?
Too expensive, performance degrades over time, you have to have a charger for them and when they run out it takes hours before they're recharged, during which you can't use whatever it is that needed batteries.
Here is an article on this by Jeff Atwood on his "Coding Horror" blog.<p><a href="http://www.codinghorror.com/blog/2008/03/adventures-in-rechargeable-batteries.html" rel="nofollow">http://www.codinghorror.com/blog/2008/03/adventures-in-recha...</a>