[Galaxy Tab 3 Q&A, Help & Troubleshooting] techman300:
Galaxy Tab 3 not charging Fix

1: Have tablet and the 2.1 amp charger with you.

2: Do not connect the charger to the device or wall socket.

3: Without charger, press and hold the power button for 60 seconds.

4. Just in case, if device starts to turn on, release power button. It normally won't on this step.

5. Then connect the charger to the tablet first and then into a working wall socket. No power-stripe, or extension cords. Wall Socket only.

6: Don't press any buttons on the tablet. Within 60 seconds the battery indicator light should come on.

7: If you see the battery charging indicator light, leave tablet connected for at least 3 minutes before trying to boot the tablet on.

8: Now after 3 minutes of charging, press and hold the power button for 60 seconds or until device starts to boot on.

9: Normally it takes about 15 seconds holding the power button but it could take up to 60 but not likely.

10: As soon as the device starts turning on release the power button immediately. Device should boot into Android OS.

11: If you notice that your Tablet is still not keeping a charge or starts turning itself off, a factory reset should been done.

12: Remember to make sure you sync your accounts and backup data if you choose too.

13: Then Go to settings and backup and reset and Make Sure you uncheck the Automatic Restore Box.

14: If the issue that is causing the power issues is within an app then you will just restore that issue back on to your device.

15: Then tap factory reset, reset device and ok to delete all data.

This should help you out tremendously.

---------- Post added at 07:32 PM ---------- Previous post was at 07:18 PM ----------

1: Have tablet and the 2.1 amp charger with you.

2: Do not connect the charger to the device or wall socket.

3: Without charger, press and hold the power button for 60 seconds.

4. Just in case, if device starts to turn on, release power button. It normally won't on this step.

5. Then connect the charger to the tablet first and then into a working wall socket. No power-stripe, or extension cords. Wall Socket only.

6: Don't press any buttons on the tablet. Within 60 seconds the battery indicator light should come on.

7: If you see the battery charging indicator light, leave tablet connected for at least 3 minutes before trying to boot the tablet on.

8: Now after 3 minutes of charging, press and hold the power button for 60 seconds or until device starts to boot on.

9: Normally it takes about 15 seconds holding the power button but it could take up to 60 but not likely.

10: As soon as the device starts turning on release the power button immediately. Device should boot into Android OS.

11: If you notice that your Tablet is still not keeping a charge or starts turning itself off, a factory reset should been done.

12: Remember to make sure you sync your accounts and backup data if you choose too.

13: Then Go to settings and backup and reset and Make Sure you uncheck the Automatic Restore Box.

14: If the issue that is causing the power issues is within an app then you will just restore that issue back on to your device.

15: Then tap factory reset, reset device and ok to delete all data.

This should help you out tremendously.