Part # BA5588A/U : 15 volt 3500mAh battery for Military applications. Fits PRC-68, PRC-128, PRC128, and PRC-136 survival radios. 

Specifications:
Brand: SAFT
Type: Lithium non-rechargeable
Voltage: 15VDC
Capacity: 3500mAh
Color: Green
Size: 3.78" x 3.54" x 1.22"
Compatible Battery part #s: