Replacement cells here are made for one specific watch body, so the case size matters as much as the series: an Apple Watch Series 5 in 40 mm takes a different battery from the 44 mm version. Samsung Watch 4 Classic, Watch 5 and Watch 5 Pro packs are listed with their EB-BR part codes, and many Apple listings give the capacity in mAh and an A-number such as A2277. Match those details to your watch before ordering.
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Frequently asked questions
How do I know which strap width fits my watch?
Does a smartwatch need its own SIM card?
What does a watch's water resistance actually mean?
Replacement cells here are made for one specific watch body, so the case size matters as much as the series: an Apple Watch Series 5 in 40 mm takes a different battery from the 44 mm version. Samsung Watch 4 Classic, Watch 5 and Watch 5 Pro packs are listed with their EB-BR part codes, and many Apple listings give the capacity in mAh and an A-number such as A2277. Match those details to your watch before ordering.