Maxell 384 SR41SW 1 Battery
Please keep these and all shiny child-attracting small batteries out of the reach of children; they are dangerous if swallowed.
Dimensions: 7.9mm Diameter x 3.6mm Height
Do not use (inherently low performing) "LR" alkaline batteries in place of silver oxide in any timepiece: alkaline batteries have declining power output.
Made in Japan
The 384 SR41SW is completely interchangeable with the 3 9 2 S R 4 1 W
Genuine Maxell Hologram Anti-Counterfeit Packaging (other packaging is not genuine)
1.55 volts 45mAh
This is a primary non rechargeable disposable battery
The 384 is a long life silver oxide chemistry with non-declining power output; alkaline batteries of the same 1.5 voltage start at 1.5 and at the half life are at .8 volts, silver oxide start at 1.55 volts and maintain the voltage until expiring. This is why silver oxide batteries are always used in watches, insulin pumps and sniper scopes or mission critical situations. Never use alkaline batteries for any device requiring a steady constant voltage. A watch with declining voltage may prove undependable.
This is from the American Watchmakers-Clockmakers Institute 2008 Edition Handbook "Battery Number System". This Battery is cross-referenced as: AWCI S13, Energizer 392/384, Energizer 384/392, Energizer MD392, Energizer MD384, UCAR 392/384, UCAR 384/392, UCAR MD392, UCAR MD384, Eveready 392/384, Eveready 384/392, Eveready MD392, Eveready MD384, Citizen 280-13, Citizen 280-11, Duracell D392/D384, Duracell D384/D392, Duracell D392, Duracell D384.
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Fits and replaces: