My girlfriend vivosmart 4 showing this and how to fix it. : r/Garmin
Support: Battery Replacement on a vívofit® 4 - YouTube
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Hands-on: Garmin Vivosmart 4, now with Pulse Ox and Body Battery | DC Rainmaker
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Replacing the Batteries
Garmin Vivosmart 4 lets you know when you need to recharge your Body Battery | Stuff