iPhone 4s doesn't charge to 100%

I have a very serious issue about my Iphone 4s now. When my iphone's battery has been lowest than 20%, it won't charge anymore. I plugged in my iphone with a wall charger but still can't charge fully and the battery will drop itself every 5 minutes until an Iphone shut down. After the next day morning, Iphone shown ''Iphone need to cool down'. I'm totally speechless. Who can give me a professional advice and solutions for how to solve it. It's ain't about the cable issue, I think it's all about the battery is about to death. PLEASE GIVE ME SOME ADVICE!

Hello kellywong3320...i hope this helps! my spouse and I also refuse to give up our 4s's We love them. But we started having the same issue. Our problems were fixed when we got new batteries installed. And, make sure you are using certified apple chargers and cables! many of the cheapies out there, especially those sold by 7-11 chains, etc. are total garbage, even melting on me during a hot day. Hope it all works out! iPhone 4s's ROCK!! Now we just need to work on SIRI and her brother MAPS. So annoying! 🙂

Cheers!

Xx

"You are recommended to fully charge it and then let it run down to flat once a month or so to maintain an accurate calibration."

This is kind of odd, I just read an article on Tesla batteries and lifetime. I image both Lithium batteries should have similar characteristics. The article showed a longer lifetime (maintaining capacity) if the batteries were not discharged fully. Just the opposite of early NiCd batteries that had a memory effect and would decrease capacity if they were not discharged fully each cycle.

I have the same issue with my iPhone 4. But I get 93% instead of 92%.

96% for me overnight last night on a 4s. I haven't been keeping track carefully (until now) but I know I 've never seen it at 100%

But if I charge it for 2 hrs, I see 100%. Kinda like you'd not leave it charging all the night, but stop charging after it's 100%.

I am seeing the same issue on my 4s and my 4 running iOS 5. Only charging to 92-93% overnight.

I watched my overnight charging more carefully.

After a couple of hours, my phone was up to 100%. Leaving it charging overnight, in the morning it was down to 96%.

This is what I'm actually talking about.

I'm having the same issue. My phone was plugged in all night and when I woke up it was reading 98%. I hope this recalibration thing is true. I'll provide more updates as more days pass.

Recalibration is an interesting theory, but even with 4 IOS devices in the house (iPads 1 and 2, iPhone 4 and 4S), this is behavior that I've never seen before.

After my phone went down to 96% charge, I left it plugged in for a few more hours. It went back to 100%. I'd have continued the experiment, but life intervened.

I went to the genius bar, my battery checked off as normal. Their only recommendation was a restore, which I'm not going for yet.

There's no way that this many people are having the same problem and that restoring the phone would fix it. BUT I will give it a try and let yall know what happens tomorrow...

same problem here. white iphone 4s 32gb.