Both Duracell and Energizer only brand the batteries, I don't think they have any real plant. Most of their batteries are from those OEM plants located in Asia. It is easy for them to get in reachrgeable fields.
It might be your charger's problem. Try test the voltage of each batteries, if they are all under 1.2V, your charger might have trouble. I had the same situation as u before but I found it is my old charger does not support the new cells.
I once dealed with MCM but gave up. their 1800mah battery is even worse than panasonic 1200mAH. I use Maha charger to charge it and could only take 30 or 40 pictures (Panasonic 1200 can take more than 80 pictures. )
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