I got this device from Garmin Service because my previous Vívosmart was dead.
This is an old device and it dies due to the battery not charging anymore after about 2 yr.
Here is the teardown log.
Use hot air(150C) and glue remover.
Took some time to pill it out.
Here it is.
Battery soldered directly on FPC.
Battery spec. 331223(pretty hard to get)
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