The battery is functioning properly with the Lumix G3. The battery indicator works. The endurance is slightly lower than those of the original battery, but is sufficient as a secondary battery in any case.
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UPDATE November 2013
After six months of use of the battery is over. It can no longer be recharged. After a few minutes the charger indicates that he was charged. Then you put him in the G3 can shoot 3 images, and it is empty again.