NOOK User Guide Power and Charging 22Sleeping: Your NOOK charges and enters USB drive mode.On (including when the touchscreen backlight is off ): If the touchscreen backlight is off, it isturned on. Your NOOK charges and enters USB drive mode.When charging, the charging indicator light to the left of the USB port lights up yellow. You canuse your NOOK for reading while it is charging by ejecting/unmounting the NOOK drive, and asupplemental drive if present. For more information, see “USB Connectivity” on page 155.4 When your NOOK is fully charged, the charging indicator light goes out.5 If you have not already ejected/unmounted the NOOK drive from your computer, and asupplemental drive if present, do so now.6 Unplug both ends of the USB cable.Charging RecommendationsYour NOOK contains a lithium polymer battery. To maximize battery life:• Partially discharge the battery rather than fully discharging it. For example, chargeyour NOOK when you see the low charge alert, rather than continuing to use it until it turnsitself off.• Avoid high temperatures if possible for charging, use, and storage. For more information,see “Temperature Ranges” on page 40.• Charge the battery half way before storing your NOOK for a week or more.• Turn your NOOK off for storage. If you are going to store your NOOK for more than aweek, turn it off.Hard ResetA hard reset is a more aggressive way of turning off your NOOK. It is not resetting yourNOOK to factory settings, which is explained in “Security Settings” on page 180.A hard reset turns your NOOK off. It also clears some state information. No content or metadata isdeleted. You should generally not need to perform a hard reset of your NOOK.You might want to perform a hard reset in these circumstances:• If your NOOK is not charging• If your NOOK is on but not responsive
