G note wont charge HELP

[Lulu Ibrahim]

yesterday before i go to sleep i plugged in my gnote in the charger it was about 30% or 25% i cant remember and i slept when i woke up i found that its 3% although the charging sign is shown and the device is (supposdly) charging so i took out the battery for 2 mins then out it back it started normally and charged for about half an hour and arrived to 12% but then it dropped to 1% then disconnected and now i try to start it the green battery sign comes and then dissapears right away i tried plugging it to my sister's s2 charger but it wont detect the charger ! any help please ?! i am running stock rom JB and also i have been noticing that recently it my gnote started to take a really long time to charge after it took basically 4 or 5 hours now it takes like 14 or 12 hours ! any help please

==update==

i was trying to reflash the rom myabe it would work but while flashing it the laptop shut off on its on i have no idea why in the middle of flashing the rom the mobile is now stuck at the downloading screen !!! i tried taking of the battery and starting it again it said Firmware upgrade encountered an issue. Please select recovery mode in Kies & try again and when i open download mode it says low battery can't download so i plugged it into the wall charger again and now its completely dead

 

[tube517]

Could be a bad USB port. Or the battery may be getting old. Do you have an extra battery to test?

 

[Lulu Ibrahim]

no i dont i tried using an s3 charger though it's now in the charger for almost 4 hours and it i back to life just telling me the same whenever i go into download or recovery mode