MacBatt is an adapter designed to replace the 1/2AA 3.6V primary lithium battery found in many Apple Macintosh computers by a common CR2032 coin cell. The PRAM battery is used to store settings like date and time, time zone, display settings (resolution and color depth), boot disk, speaker volume, 24/32bit memory addressing selection, and more. Additionally, some Macintosh models require a fresh battery installed in order to output a video signal, or to turn on.
MacBatt sits flat in the battery holder and snap securely into place without moving. The contact is made by a pair of gold-plated castellations on the edge of MacBatt adapter PCB.