Samsung Galaxy Watch was initially named as Gear S4 and introduced on August 2018. It has different version in different countries. The global version’s models are SM-R805F, SM-R805N, SM-R815F and SM-R815N，while in USA and Canada its models are SM-805U, SM-805W, SM-815U, SM-815W. China has a special model number SM-R8050.
In below we’ll introduce how to change its internal battery in details:
Firstly remove four screws on the back of watch as below picture.
Use plastic pick to pry the watch’s back cover.
Remove sensor cable
Remove back cover
Remove display cable
Take the core parts out
Remove sensor cable
Remove button cable
Remove screw
Pry the mainboard
Take the mainboard out
Remove the old battery
Replace new battery
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