Well after what went on in Moab with my batteries failing in the cold weather. i was inspired to deep recycle my batteries all six of them and almost done. But if you want to do this , here is the process turn camera on and drain to fully discharged than charge over again. Make sure in the menu you set camera to not turn off. Now my batteries maybe close to end of useful life since there are countless recharging and over 30 k on my actuations with my bodies. not sure how long these batteries will truly last but if anyone will know it will most likely be me first since i had these since day one and maybe have shot more on them than most people. Hopefully this deep recycle will bring them back to life much better.