SL-750/S - Tadiran 3.6V Inorganic Lithium Half-AA Sized Battery (LS14250)
The Tadiran 3.6V Inorganic Lithium battery is a non-rechargeable half sized AA battery and is used in Apple Macs for PRAM backup.
Also known as SAFT Lithium 3.6V LS14250, SL750, 1/2 R6, 104/8AA, it replaces Hawker Eternacell (No longer manufactured)
The Tadiran (Sonnenschein) 1/2 AA lithium battery is also used in Dive computers such as the Nexus scuba diving computer, some Suunto and Aladin dive computers.
Dimensions: 14.7mm diameter x 25.2mm high