I have the I9000 . Until this morning I haven't had any problems with my phone. I was on C-ROM KK 5.8 (not that it affects my problem) and last night I left my phone to recharge. This morning I've unplugged my phone from the wall charger and made a reboot (my morning routine). Strange thing happened. The phone went into the phone off connected to wall charger screen mode but showing that the battery is empty. I took my battery out and now every time I place it back in my phone, the screen goes on showing empty battery or it's checking for battery level, without even touching any buttons. If I try to go from that screen to make my phone boot using the power button it does not react. I can't go in recovery mode , only I can go into Download Mode from that screen. I went back to 2.3.6 JVU using Odin and rooted it, phone booted fine. Now the thing is : When I am turning off my phone the phone keeps doing that battery screen problem. It turns screen on, acts like it's in a wall charger or it's checking for battery level or something and keep showing me an empty battery for a second then the screen goes off and back on again and only way to make my phone usable is to flash using Odin , the 2.3.6 stock ROM again and not take my battery out. If I try to flash CM 11, it goes into a recovery loop (because it's changing partitions sizes and the recovery version) and I have to take my battery out and it does it again. If I turn my phone off, my phone does it again and only way to boot it is to flash something from Odin so it forces it to boot.
Please Help ! What could be the problem and it's there a way to fix it?
Edit: I've been using my phone for an hour with on the Stock 2.3.6 and the battery level dropped just a bit . So The battery is not draining completely, and that fast. Also I've tried with a different battery and the problem persists. And my battery works just fine on a friend's GT-I9000. I've also successfully flashed Mackay CM9 2014 1.7, the situation didn't change. Also tried with Samsung 2.3.6 JW4