Alright, now that you have this precious phone, there are somethings that need to be done. Some of these you have to do and some of them are optional.
THINGS YOU HAVE TO DO:
- Go to Settings - Display - Brightness. Un-tick Auto brightness and set the brightness as desired.
- Go to Settings -Applications. Tick 'Unknown Sources' and Un-tick 'Fast Boot' (This you can switch back on once the 'Battery Calibration' (later) has been done). Then go to Development and Tick 'USB Debugging'
- Go to Settings - Accounts Sync. Here you can set the duration between syncs. This depends on you. If you need your News & Weather updated every 5 mins, you should be prepared to have shitty battery life. Some things here can be frequently updated while some can be on 4 hour intervals.
(http://www.htcdesirehdforum.com/htc-desire-hd-how-to/calibrate-desire-battery-it-worked-for-me-!!/)
Power on your Desire HD then connect to your Charger and Fully charge until the LED changes Green.
- Disconnect your phone from the charger and then power off.
- Reconnect your phone to your charger with the power off and wait for the green LED. (If your LED turns green immediately, then you did not switch off the Fast Boot. The Fast Boot option keeps the phone a little alive in order to attain the fast boot. For this exercise, Fast Boot needs to be disabled)
- Disconnect the phone from the charger and power it on.
- Once the phone has fully booted / ready to use ... power off again.
- With the power off connect the phone to the charger and wait for the green LED.
- Disconnect from the Charger then power on and use normally.
