iPhone 3GS battery drains fast after restore
My old battery drains fast (like 10 hour standby from full charge) so I bought the replacement battery from ifixit. I replaced it. My iPhone kept rebooting every 3 minutes. It turned out that the battery was defective so ifixit sent me a new one.
I received the new battery 3 days later. I went to replaced this new battery. The standby time was better. 18 hours and the battery indicator only showed 88%. No phone calls, no web surfing. I just let it sit on the table. I installed the Nextflix app to test the battery more. I finished the movie when the battery indicator showed 44%. I left the iphone on the table without charging it and went to sleep. Woke up in the morning and the iphone was dead. I went to charge it to 50%. Tried to use it but it kept rebooting. Restored it with ios 4.0 (no backup). The rebooting issue went away but now the battery drains fast. Only 10 hours standby like my old battery. I always have every battery-draining feattures turned off such as Enable 3G, Cellular Data, Internet Tethering, Bluetooth, Location Services, Fetch New Data Push. All off. Brightness is at 1/3 of the bar. Again no phone calls, no web surfing or watching videos.
Any idea as to why my iphone did that? or is it the battery again?
Is this a good question?