Reliably power all types of devices with Energizers A23 12-Volt Batteries. The A23 is common in medical equipment, keyless entry fobs, garage door openers and more. This 12-volt miniature alkaline battery serves as a replacement for 1181A, A23BP, DL21, DL23, MN-218, MN21 and V23GA. Per 2. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Size: A23 12V 2PK. Type: Batteries.