Tools Gift + 190mAh 240mAh 352724 322826 Battery For Polar M430 M400 GPS Sport Smart Watch
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How to open / disassembly Polar M430 for battery replacement - YouTube
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3.8V Battery Core for POLAR M430 M400 GPS Sports Watch New Li-Polymer Rechargeable Accumulator Replacement+USB cable+toolkit - AliExpress
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