I've had excellent battery usage, generally three days, but I don't know if what is happening to my device is a W10M issue or not. The M8W's cousin the M8A doesn't have this issue and I hope someone here can help me. The HTC "block" charger I have is 1.0A output; right this very moment I don't have a non-HTC wall charger and I'm stuck in this constant reboot hell where I get the spinning cogs, a restart, an occasional pouty face. I fail to understand why the device needs to restart at all and be allowed to charge from being off like its cousins. It's a ridiculous problem to have. None of these M8Ws will charge without being made to automatically turn on? Just aggravated by this issue.