I bought my Fitbit Blaze (remember those?) in 2016. Battery is on its last legs. I will be heartbroken when it's time to retire this bad boy. : r/ fitbit
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Solved: Blaze battery draining fast - Fitbit Community
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Fitbit, Blaze, Fb502 replacement battery
Original Replacement Battery Lssp321830ae For Fitbit Ionic Smart Sports Watch Fitbit Blaze Fb502 Lssp321830 Watch Battery + Tool - Mobile Phone Batteries - AliExpress
Amazon.com: Synergy Digital Smartwatch Battery, Works with FitBit Blaze Smartwatch, (Li-Pol, 3.7V, 120 mAh) Ultra Hi-Capacity, Compatible with FitBit Blaze Battery : Cell Phones & Accessories