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Hi @Cazo61, welcome to our Fitbit Community. Regarding the battery draining issue that your Fitbit Sense has experienced, I'd like you to try the tips that are listed in this help article. After this, monitor the battery's behavior and see if it doesn't drain that fast.
Keep me posted on the outcome.
Best Answer@Cazo61 Hello! Go into the Fitbit app and check the apps that are installed on your Fitbit. If you see “SpO2 Tracker” listed as installed on your Fitbit, then that is the likely culprit. I removed it from mine because of the crazy battery drain.
Best Answer