MAXELL 348 SR421SW - 1 Battery Official OEM

Product Description

Superior Maxell Micro Silver Oxide SR421SW One Battery Official 348

Do not use (inherently low performing) alkaline batteries in place of silver oxide in any timepiece.

Made in Japan
Genuine Maxell Hologram Anti-Counterfeit Packaging (other package is not genuine)
Dimensions 4.8mm Diameter x 2.1mm Height
1.55 volts 12 mAh
Mercury Free
This is a primary non rechargeable disposable battery

The 348 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 cannot give the correct time.

Fits and Replaces: This is from the American Watchmakers-Clockmakers Institute 2008 Edition Handbook "Battery Number System". This Battery is cross-referenced as: AWCI S72, Energizer 348, UCAR 348, Union Carbide 348, Eveready 348, Interstate Batteries AWAC5090, Maxell SR421SW, Panasonic SR421SW, National SR421SW, Seiko SR421SW, Seiko SB-A6, Toshiba SR421SW