Samsung Galaxy Tab S2 8.0 Battery Replacement

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If the tablet is not staying on unless plugged in, replacing the battery should solve the problem.

Working on a device that is turned on may yield an electric shock. Make sure your device is turned off before working on it.
Apply heat using an iFixit iOpener or another heating gun in order to weaken the adhesive around the edges of the screen.

Insert the plastic opening tool into the gap between the screen and tablet in the location where you want to start removing the screen.
Put an opening pick in the gap created, in between the screen and the panel.
Repeat all around device, putting 2 picks on top and bottom, and one on each side.

Carefully remove the small suction cup from the corner without moving the screen.
Place the small suction cup in the center of the screen and lift to remove screen.
Make sure to separate all glue under the middle parts of the screen as well as the edges - use a thin stiff card to slice through it. Avoid the ribbon cable. Do not attempt to lift the screen until all glue is separated.
The screen is still connected to the rest of the device by a cable, so don't pull the screen up too quickly.

Place the plastic opening tool underneath the ribbon cable connecting the screen to the tablet.
Carefully lift the plastic opening tool to detach the ribbon from the tablet.
Make sure to discharge any static electricity by touching a grounded metal object, like a quarter, before touching the inside of the device.

Remove the 13 3mm screws from around the edges of the board using a Phillips #1 screwdriver head.
Lift up and remove the panel of the board using a plastic opening tool.