This manual will guide you through the process of replacing a battery in an iPhone 8 and give its battery the power to last as new.
To avoid damaging the display cables, this manual instructs you to remove the display part from the device. However, if you are willing to risk this, you may skip this part and move directly to the battery replacement part.
For optimal performance after replacing the battery, calibrate the new battery: discharge it under 10% and then recharge without interrupting to 100%.
Before you start, discharge the iPhone under 25%. A charged battery could catch fire or explode, if accidentally infringed.
Opening the iPhone 8 will compromise its waterproof seals. If you do not replace them, the device will be functional, but no longer waterproof.
Warming up will help you cut through the remaining adhesive, which secures the display, allowing for easier opening.
Makes sure that the suction cup does not cover the home button, as this as this will prevent a seal from forming.
The watertight adhesive, which secures the display at place, is very strong and creating this little gap requires a significant amount of force. If necessary, loosen the display by an upwards-downwards movement, to create enough room for the spudger.
Do not move it all the way to the top side of the display, as this may damage the plastic clips which secure the display.
Do not slide the pick too deep inside, this could damage the display cables which are located on this side of the device. Slide it it, maximum, to the width of the display frame.
Use the suction cup to lift the display and open the device.
Do not lift it into more than a 15° angle, as this part is still connected to the cover by thin flat cables, that could easily get damaged.
Remove the suction cup.
Insert a pick into the gap on the upper side of the device to cut the remaining adhesive.
Be careful, not to damage the plastic clips on the edge of the phone.
Do not try to completely separate the display from the rare cover, as it is still connected by fragile cables.
Make sure that when re-assembling the phone, you use the correct screws and return them to their prior place to avoid damaging the device.
Bend the connector cable outside of the device, to avoid electrical contact with other parts.
Before you continue, make sure that the battery is disconnected.
When re-connecting the cables, press down on their edges until you hear them click back. Do not press down in the middle, as this could permanently damage them. If you see any white lines on the display, or notice lack of touch response, make sure that this cable is properly connected.
This connector should likewise be re-connected on the edges, to avoid damaging it.
IPhone 8 battery is secure by 4 double-sided adhesive tapes – two on the top of the battery and two at the bottom.
Each tape has a black ending, stuck on the top of the battery, so you can recognize it easily.
Remove the ending of the first tape, which is located at the bottom right side of the battery.
Use round tweezers or fingernails, to avoid damaging the battery.
It is easiest to remove the tape first by pulling it out with fingers, and after you managed to pull out a large enough part of it, wrap it around the ends of the tweezers.
Hold the tapes straightened while pulling them out, and make sure they do not twist. If they stick onto something or to themselves, they might rip.
The tapes have a tendency to return to their original length. If it slips through your fingers, just get hold of it and continue pulling.
Install it into the phone by following the steps in reversed order.
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