Iphone 4s. Bought it used on ebay about 2 years ago. It was excellent condition. Phone was great until last year when the battery would wear out very quickly. By that i mean it would drain out without me using it much at all during the day. I noticed the iphone would turn off when battery was 18% or so. I then got a replacement battery at one of those phone repair shops. I went to a certain one that had very good reviews. Well i then noticed my battery was okay but not like a brand new one. Even when i first got my iphone4s, the battery for it was very good. The battery was similar... it turns off at 18%. However, i had noticed lately that it even turns off as high as 32%... and then 42%. Right now it turns off around 42%. Does this mean the battery replacement i got is defective? Here is the other thing. I had updated my iphone to the latest ios. Does that mean that could be an issue? Another thing though is i had lot of problems with my iphone. For example, many times it would go silent then ringer etc. It seems like some sort of glitch or like if i was turning ringer silent on and off myself. Does that make sense? I had then pushed that button down... its on the left side of the iphone4s. Also there been times when my iphone doesn't really work at all and i had to put rice over it. Then it would work. What are my solution now? The other thing is im wondering... could i have some settings on that make my iphone drain battery so fast? Also i noticed i have a keepass logo in the top right of my iphone. It was never there. Could that be a reason? Why is that even there? I dont have keepass on all the time. Could my iphone just have damage and be defective now that getting replacement battery is no use? Do you suggest me do a complete restore of my iphone and wipe everything out and start from new? Would that solve this entire issue? But if i do this, my phone number will be saved and everything else right? However when i first got the new battery, it was a lot better than the battery that drained really fast. However i have lot of issues with iphone now. For example if i want to turn my iphone off by holding the power button then sliding it to the right... i can't ever do this really because the moment i slide it to the right it doesn't allow me to but soft of turn off. Recommendations for this? I do like my iphone4s a lot when i first got it. However, the biggest issue is the battery. I cannot get use of it if it turns off at 42%. Also throughout the day even when i dont use my iphone but have wifi turned on... it would drain from 100 to like 75 percent. Back then... it would go down to maybe 97%?