There are a couple of charging problems experienced within Galaxy Note 2 phones and they include not charging or the phone takes too long to charge. If you plug your Note 2 smartphone through AC adapter or USB port in your PC and discover that it is does not charge, you need to make sure that the Micro USB port on the phone is clean.
Dust could block the flow of current and you can try using compressed air to clear the dust. Another way you can solve this problem is by rebooting the phone and try connecting again. Some users have reported that the charging works perfect when they try to reboot the phone. This however may not be a permanent solution and should the problem persist, you need to contact Samsung technicians through a primed store.
If the phone takes too long to charge, instead of taking the required time of two or three hours, then you should make sure that you are using the right 2A rated charger. The charger that is shipped with the device is the most efficient although you can try another charger if the one shipped with the device is damaged.
If the problem is not solved, it could mean that the battery is faulty and you need to contact Samsung. Some users have also reported that the phone produces some sound while charging. Many users have reported that their phones are producing a hissing or buzzing sound when charging. This problem is cause by the charger and it is abnormal. The solution to this is by charging using USB PC port but then again unless the PC is super quiet, it may not help or it could take longer to charge.
Other solutions to this problem are trying a different charger or lower rated charger, which will charge slowly with less noise. If the problem persists, you may try charging in a different room where noise does not disrupt you though this is not ideal.