so slowly it goes from the air .....

I bought this battery as a spare for my EOS 60D. The only difference from the original Canon is the somewhat low power
(1620 mAh instead 1800 with the original). That was me before but known and presents no problem at all. On 10% less power, you can do without. In viewing mode you still come here to over 1,000 photos per charge.
The battery is fully recognized by the camera, and also in the original charger, there are no difficulties.
Since the part currently costs only one third of Canon batteries, I can forgive conscientiously 5 star here.

Addendum 09.02.2012: After I now since a 3/4 year use (always in alternation with the original) I am sorry to find the part that it in terms of performance degrades sharply. He now holds a maximum of only half as long as the original. I respect even sure that each battery is always discharged. When Canon battery I can not detect any drop in performance. So I subtract a star.