Cells for the Apple Watch Series 4, 5, 6, 8 and SE, and for the Samsung Watch 4 Classic, Watch 5 and Watch 5 Pro. Case size decides the battery: a 40 mm and a 44 mm watch of the same series take different cells with different capacities. Apple parts are identified by an A-number and Samsung ones by an EB-BR code, so compare it with your old battery; titles also state whether a cell is ORG, OEM or service pack.
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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?
Cells for the Apple Watch Series 4, 5, 6, 8 and SE, and for the Samsung Watch 4 Classic, Watch 5 and Watch 5 Pro. Case size decides the battery: a 40 mm and a 44 mm watch of the same series take different cells with different capacities. Apple parts are identified by an A-number and Samsung ones by an EB-BR code, so compare it with your old battery; titles also state whether a cell is ORG, OEM or service pack.