I have noticed around same battery behavior on 3 of my batts... it is good until 50% of the battery life (as indicated from the M body), from there it dies out rather so quickly. What I noticed is when the battery is still new, it works fine. But as time goes on, say like after a few months of use, it drains out quickly when below 50%, I got one batt that just shuts off the camera because battery is too weak to power it up. Any thoughts on this?
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