i bought my samsung galaxy s3 6 months ago. it was working fine till now.
four days back i plugged my phone to stock charger when it was at 4% and when i woke up after 10 hrs it was just 20%. THERE was no power outage and the red LED was always on. and while charging if i used phone battery would drain. so just to check if my charger was working fine i charged my friend's phone it worked fine. my brother gave me spare battery and charger. when i charge with new battery and charger the phone charges quickly only when the mobile data is turned off and f mobile data is turned on it takes forever. also now when i use simple apps like whatsapp for chatting i can practically see battery drain at rate of 1% per 2-3 min. ( i had ice cream sandwitch os
and after update it was jb 4.1.2 but even after update it has been working fine till four days back) i tried removing battery and putting it in, restarting it and even tried factory reset but in vain. plz help