Maxell 364 SR621SW 10 Batteries

Please keep these and all shiny child-attracting small batteries out of the reach of children; batteries are dangerous if swallowed.

Dimensions: 6.8mm Diameter x 2.1mm Height

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Do not use (inherently low performing) "LR" alkaline batteries in place of silver oxide in any timepiece: alkaline have declining power output.

Made in Japan
There is no battery SR826W: a dyslexic typo
Genuine Maxell Hologram Anti-Counterfeit Packaging (other package is not genuine)
1.55 volts 23mAh
Mercury Free
This is a primary non rechargeable disposable battery

The 364 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 not be dependable.

This is from the American Watchmakers-Clockmakers Institute 2008 Edition Handbook "Battery Number System". This Battery is cross-referenced as: AWCI S14, Energizer 364/3 6 3, Energizer 3 6 3/364, Energizer MD364, Energizer MD3 6 3, Union Carbide 3 63, Union Carbide 364, Union Carbide 3 6 3/364, Union Carbide 364/3 6 3, UCAR 364/3 6 3, UCAR 3 6 3/364, UCAR MD364, UCAR MD3 6 3, Eve 6 3, Mallory D364, Gold Peak GP64, Sylva-Cell GP64, Maxell SR621SW, Panasonic SP364, Panasonic SP3 6 3, Panasonic SR621SW, National SP364, National SP3 6 3, National SR621SW, Rayovac 364, Rayovac 3 6 3, Rayovac RW320, Renata 364, Renata 3 6 3, Renata 51, Renata 31, Seiko TR621SW, Seiko SR/TR621SW, Seiko SB-DG, Seiko SB-AG, Sony SR621SW, Sony 364, Sony 3 6 3, Timex T Cell, Toshiba SR621SW, Toshiba W1V, Toshiba D1V, Varta V364, Varta V3 6 3, Varta 531, there is NO SR821SW a misreading of SR621SW

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Fits and replaces: