The Apple iPhone 5s was announced on September 10, 2013. Repair of this device is similar to the previous models, and requires screwdrivers and prying tools. Available as GSM or CDMA / 16, 32, or 64 GB / Silver, Gold, and Space Gray.

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Why my Battery drains so Fast?!

Hi there!

I have an iPhone 5S which I traded a broken Galaxy S6E for.The phone looks good, problem is that the battery drains a bit quicker than expected. It gets a bit warm but very little. It continues to drain overnight or in my pocket, Wien 20/30/40% randomly shuts down and it doesen’t accept all the cables. He gave me the original cable which seems to work for now.I’ve read on the Internet that it may be iOS 11.2.1 that causes issues, but not sure.

Answered! View the answer I have this problem too

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Check the health of the battery using one of these:

Windows: 3UTools

Mac OS X: Coconutbattery

iOS: Battery Life

If your battery health is close to 80% or lower, consider replacing the battery.

You have a few options on getting a battery replacement, either by:

- Doing it yourself (DIY).

- Taking it to a mobile phone repair shop.

- Taking it to the apple store (booking a genius bar appointment).

Guide to replace the battery:

How to replace the battery in your iPhone 5s

You can buy a replacement battery from iFixit here:

iPhone 5s Replacement Battery

iPhone 5s Replacement Battery Image


iPhone 5s Replacement Battery


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Battery life seems ok I think...


Yeah battery life looks okay.

Backup your phone first, then do an restore via iTunes then restore from iTunes backup, sometimes this helps with rapid battery drain when the battery health is good.

iTunes backup stores your photos, contacts, settings and some app data. You will need to sign in to certain apps again after restoring the iPhone.


I've already done that, from what I see, instant amperage is pretty low (120mA)... maybe is because my cable was repaired. Anyway, I'll be swapping the back case with all the components soon and I'll post a comment here as an update if I fixed anything. Have a great day !


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If it dies fast and you tested the battery, you have a faulty U2 IC chip and needs to be replaced and resoldered!

A board level technician will be able to replace it for you!

Also using third party cables and modified cables can also blow the U2 IC Tristar chip on the board and you get those symptoms!

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