How to replace the battery of Apple iPhone 6 Plus

Power off your iPhone before beginning disassembly. 

Remove the two 3.6 mm Pentalobe screws next to the Lightning connector.

The next two steps demonstrate using the iSclack, a great tool for safely opening the iPhone 6 Plus that we recommend for anyone doing more than one repair. 

 If the plastic depth gauge is attached at the center of the iSclack, remove it now—it's not needed for larger phones like the iPhone 6 Plus.
Close the handle on the iSclack, opening the suction cup jaws.
Place the bottom of your iPhone in between the suction cups.
Position the iSclack's upper suction cup against the display, near the home button. Open the handles to close the jaws of the iSclack. Center the suction cups and press them firmly onto the top and bottom of the iPhone.

Hold onto your iPhone securely and close the handle of the iSclack to separate the suction cups, pulling the front panel up from the rear case. The iSclack is designed to safely open your iPhone enough to separate the pieces, but not enough to damage any of the display cables. Peel the two suction cups off your iPhone.

If you don't have an iSclack, use a single suction cup to lift the front panel: Press a suction cup onto the screen, just above the home button.

 Be sure the cup is pressed securely onto the screen to get a tight seal.

If you don't have an iSclack, use a single suction cup to lift the front panel: Press a suction cup onto the screen, just above the home button.
Be sure the cup is pressed securely onto the screen to get a tight seal.

Pull the plastic nub to release the vacuum seal on the suction cup. Remove the suction cup from the display assembly.

Pull the home button end of the front panel assembly away from the rear case, using the top of the phone as a hinge. During the next few steps, until you remove the front panel assembly, keep it supported at a 90 degree angle in relation to the rear case

Several clips along the top edge of the front panel form a partial hinge, allowing the front panel assembly to swing open like a book. During reassembly, align the clips just below the top edge of the rear case. Then, slide the front panel upward until its top edge is flush with that of the rear case.

While holding the front panel open at about a 90 degree angle, remove the following screws securing the front panel assembly cable bracket:

Three 1.2 mm Phillips #00 screws
One 1.5 mm Phillips #00 screw
One 2.9 mm Phillips #00 screw

Remove the front panel assembly cable bracket from the logic board.

In the next four steps, take care to pry up only on the cable connectors, and not on their sockets on the logic board. While still supporting the front panel, use a plastic opening tool to disconnect the front facing camera and earpiece speaker cable connector.

Use a plastic opening tool to disconnect the home button cable connector.

Use a plastic opening tool to disconnect the display data cable connector. When reassembling your phone, the display data cable may pop off the connector. This can result in white lines or a blank screen when powering your phone back on. If that happens, simply reconnect the cable and power cycle your phone. The best way to power cycle your phone is to disconnect and reconnect the battery connector.

Finally, use a plastic opening tool to disconnect the digitizer cable connector.

Remove the front panel assembly rom the rear case.

Remove the following screws from the battery connector bracket:
One 2.3 mm Phillips #00 screw
One 3.1 mm Phillips #00 screw

Remove the metal battery connector bracket from the iPhone.

Use a plastic opening tool to gently pry the battery connector up from its socket on the logic board. Take care to only pry up on the battery connector, and not the socket on the logic board. If you pry up on the logic board socket, you may break the connector entirely.

Peel back the first battery adhesive tab from the bottom right edge of the battery. Use your fingers or blunt tweezers. Be extra careful when working near the battery; puncturing a lithium-ion battery can release dangerous chemicals and cause a fire.

Gently pull the battery adhesive tab away from the battery, toward the bottom of the iPhone.

To avoid tearing the adhesive strip, be careful not to pull against the battery or lower components.
Continue pulling, allowing the strip to slowly slip out from between the battery and the rear case. When you feel increased resistance from the strip, stop pulling and continue with the next step.
If the battery adhesive tabs break during the removal process, use your fingers or blunt tweezers to retrieve the remaining length of adhesive, and continue pulling.

When you feel increased resistance from the adhesive strip, pull it gently around the lower right corner of the battery. Avoid snagging the adhesive strip on the corner of the battery or the strip may tear or break.

Continue pulling the adhesive tab upward and away from the right edge of the battery, allowing it to slowly slide out from between the battery and the rear case, until the strip comes free from the iPhone. Don't allow the adhesive strip to snag on the battery connector, or it may tear or break off.

Peel back the second battery adhesive tab from the bottom left edge of the battery. Again, gently pull the battery adhesive tab upward and away from the battery, allowing the adhesive strip to slowly slide out from between the battery and the rear case. Continue pulling the adhesive tab until you feel increased resistance, and then stop.

When you feel increased resistance from the adhesive strip, pull it gently around the lower left corner of the battery. Don't allow the adhesive strip to snag on the corner of the battery, or it may tear or break off. Continue pulling the adhesive tab upward and away from the left edge of the battery, allowing it to slowly slide out from between the battery and the rear case, until the strip comes free from the iPhone.

Peel back the final battery adhesive tab from the bottom edge of the battery. Gently pull the battery adhesive tab upward and away from the battery, allowing the adhesive strip to slowly slide out from between the battery and the rear case.

Continue pulling until the final strip comes free from the iPhone.

Flip the iPhone back over and insert a plastic card between the left side of the battery and the rear case. Be careful to keep the card as flat as possible to avoid bending the battery, which may damage it and cause it to release dangerous chemicals. Press the card in farther to break up the adhesive behind the battery.

Remove the battery from the iPhone.