I just bought a new Canon LC-E6 charger and am experiencing an interesting phenomenon.
When I put original Canon batteries in the charger, everything is fine. But when I put a Sterlingtek battery in the charger, it blinks like crazy. I don't know if the charger is actually charging the battery.
This does not occur with the charger that came with my camera. And I have no problem with the Sterlingtek charger.
But it appears that the new charger has done something to the battery because I get an error message in the camera when I turn it on -- cannot communicate with the battery or communications with the battery is irregular.
Has anybody else seen anything like this?
Checking another part of this forum, it appears that the problem might be related to the 5D3 firmware update. Check that thread under the cameras section of this forum.

