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Hello, not sure what is going on with my z1, it has a green light when charging but its painfully slow, its in the 20 -30% constantly but has a green light when charging, I have tried vasrious cables and power sources. pc/laptop/plug no change 
The device should have a orange LED on the top. That's weird. Try restarting your device or going into safe mode and charge it. Is it still green or orange? Try also charging it with the device OFF