Duracell A23 The Duracell A23 12V battery is a specilised battery that provides reliable, long-lasting power for your devices. Supplied in a convenient twin pack. They have up to a 10-year guarantee in storage so you can be confident these lithium coin button batteries will be ready when you need them. To help ensure the safety of your children, they have been designed with child-resistant packaging. And you can be assured that they’re batteries you can trust because Duracell is the #1 trusted battery brand.