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Replaced Battery/dock connector no charge after battery drained

I recently replaced the battery, dock connector in my iPhone 4s sometime this month. Everything went back together smooth and worked great. (The old dock connector in the phone would only work with one charger and I used that charger the other day not sure if this has anything to do with it or not). Today the battery was completely drained down to nothing for the 1st time since the repair. Ever since I have not been able to get it to hold a charge or even become recognized by any device with multiple chargers. I tried to reset the phone while being plugged in using the home/power button method and got nothing. Do you think I got a defective battery or maybe even dock connector as well? Both were new and have a 1 year warranty through this site. Any help would be appreciated

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If you have a warranty on them I would get them replaced.

It sounds like your battery has either discharged itself below 2.9v which triggers a protective circuit that puts the battery to sleep. It can be woken up with a boost charger such as one made by Cadex. With Li-ion batteries they won't charge at all if in this protective sleep mode unless you boost them with higher voltage for a short period to wake the battery, then they can be charged as normal. Also using the wrong charger for the battery will affect its life time because it may be getting to low of voltage or to high which eventually leads to damage or swelling to the battery. I've also learned not to leave them on chargers to long(such as charging them while sleeping every night). Li-ion batteries prefer to be charged to 80-90% and recharged at around 20-30% if I remember correctly which makes the battery last longer.

But I would just have it replaced if its free.

If you want to try boosting it then there are a few ways it can be done without buying a new charger. I only suggest doing this if you have a multimeter and know how to use it to check batteries voltage. These internal batteries are a lot harder to do this to than removable batteries like Samsung uses. You can take an old usb charging cable that hooks into your pc or wall and cut off the end with the micro usb and expose its wires(while unplugged). Next strip the black and red wires ends. I took the ends of the wires and attached them to an extra set of multimeter probes. I put them on the ends that plug into the multimeter. Now you plug in the usb cable and take the red wire and put it to your batteries positive and take the black wire and put it to your batteries negative. After 30 seconds to a minute, it should boost your batteries voltage back to a chargeable state. I have done this with numerous batteries that read 0v with a tester and I got it up to 3.9v or what ever range I needed within a minute or so. If you do this make sure the battery doesn't get to warm or you could damage it. There are videos on youtube that show this type of procedure.

Good luck and hope I was helpful.

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4 Comments:

Thanks, I appreciate you're help I will try seeing what I have voltage wise with my fluke and go from there, just need to find out what I need to do for a warranty with the parts I purchased from here.

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I also will be replacing the dock connector again because it is under the warranty as well.

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Turns out to just be the dock connector that failed, the battery wasn't the issue. Replaced it and voila good as new again. I think the main clue was that nothing was recognizing the device which rules the battery out of being the issue.

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Glad to hear you got it figured out. Thanks for replying back with your solution to the problem as it will likely help someone in the same situation.

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