The charger works great and handles AA and AAA batteries with ease, even at the same time. I have not tried 9V, C or D cells yet, but it looks like they would be just as easy to put into and take out of the unit. The main thing I like is it will charge any brand of NiMH battery I've thrown at it. The fist NiMH charger I purchased (and returned) would only charge one brand of battery.
I absolutely love this but the battery life is not very long but the fact that you can use/charge it at the same time makes up for it unlike other bluetooth wireless audio devices.
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