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When first Purchase batery can last 5 days, After 1 year, batery now only can last 2 days. Can i change the batery and where?

Hi, Is your Fitbit still under warranty? If not you may want to try a battery replacement yourself. Here’s a guide with tools and parts required: Fitbit Surge Battery Replacement Here’s a tear down guide for you also: FitBit Surge Teardown