There is rumour in the interet that after the 5D MK III latest firmware your third party batteries dont work properly with the camera... you could easilly think after reading these writings...that you camera would Freeze or work not all....

This was again...hmm... Bull S#it if speaking honestly and straight.... xD
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This is 2 Day for Musical May

Rush - Freeze

Sometimes I freeze...until the light comes
Sometimes I fly...into the night
Sometimes I fight...against the darkness
Sometimes I'm wrong...sometimes I'm right

Coiled for the spring
Or caught like a creature in the headlights
Into a desperate panic
Or a tempest of blind fury...