Do Unopened Batteries Expire. This depends on the type of battery. On the outside of the box will be an expiration date.
Yes unused batteries do go bad meaning that they lose their charge over time. Learn about alkaline battery life AA battery life 9V battery life and more. One cell was completely flat the other two cells were at 21 volts each.
The batteries go dead.
Replace smoke detector batteries during a notable time of the year such as the New Year January 1. For example Energizer says its Ultimate Lithium batteries will last up to 10 or 20 years depending on the size while Energize Max batteries have a. The actual term Expiration Date refers to the last date a food should be eaten or used. My father has an unopened box of battery acid from over 20 years ago so I thought I might try to revive the flat cell.
