The Polarised Pinned Panasonic Lithium BR-2/3A-E2SP is used as the back-up in instruments that have a lithium battery to back-up the buffer and real-time clock in the event of main battery failure.
This version has the special double pin at 8.2mm pitch.
Used in GE Fanuc PLC controllers and Texas Instruments PLC controllers and we have also been told by a music lover that it found in a Sequential Circuits Sythesizer, Replacing the BR-2/3AE and 2587678-8008 among others.
This cell is also known as the BR17335 and the CR17335. A standard and tagged version of this cell are also available.