What is the recommended expiration date?

2 November 2021

JIS (Japanese Industrial Standards) defines the [Recommended usage period] as “a period in which the battery operates normally if it is started to be used within that period and satisfies the performance such as the duration specified in JIS”. The recommended expiration date is 2 digits per month-year (09-2014 for September 2014), and is displayed on the package for small batteries such as button batteries.
The [Recommended usage period] is not set in JIS and is to be agreed by each battery manufacturer.

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