Fourth generation iPhone. Repair is straightforward, but the front glass and LCD must be replaced as a unit. GSM / 8, 16, or 32 GB capacity / Model A1332 / Black and White.

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Why is phone hot when charging/in use and losing charge rapidly?

iPhone 4 model A1332


About 2 weeks ago, I noticed my phone getting VERY hot in the upper right corner when looking at the screen. Battery takes hours to charge, often never actually reaching 100%. Charge is depleted with very minimal use. The phone is hot when charging and when in use. Cools down some if idle.

I have ensured no apps are running in the background. I purchased two batteries from different sources at the same time to possibly prevent receiving a bad battery and having to await replacement, etc. Also purchased a new charger.

I changed the battery x1 with no significant change. I then deleted email accounts after reading that this provided resolution for some, reset network settings, turned off cellular data, and put in airplane mode.

Still no significant change. I did get a 100% charge ONCE after first battery change but was depleted in less than 2 hours.

I have just installed the second battery. It was at 20% when I turned the phone on. Within 10 minutes it was at 16%. I have placed it on the charger and waiting.

Any idea what is going on? So frustrating! I am at a loss.

Thanks in advice for any insight!

Answer this question I have this problem too

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1 Answer

I see this in many water damaged phones and it's a problem with the motherboard

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I have had this phone since June. Moisture sensors were intact/unchanged when I bought it and still are. No problems with the phone prior to this and it hasn't been exposed to moisture since I have had it. What are my options to determine if it is the motherboard? I can't really afford to buy another phone at the moment but sounds like it may be just as expensive to troubleshoot this one.


If you have changed battery and charging port then that's all the troubleshooting you can do.. If you had another iPhone 4 that is going good then use you motherboard in that frame and see if it still drains if it does it's a board problem


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Laura will be eternally grateful.
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