Simply Choose Brand (either to match existing or because you want to upgrade) from the drop down menu above. All batteries are the same size and voltage, just the brand is different. Sony no longer sell batteries, Murata is the new brand name,and manufacturer. We recommend the use of these Silver Oxide in watches which will provide a more stable operating environment. Technical Details: 1.55v Nominal 9.5mm Diameter x 3.6mm Known as: 394 SR936SW SR45 TIMEX LA 280-17 SB-A4.
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