This is a genuine original battery for use in the Zoll AED Pro, part number 8000-0860-01.

Zoll AED Pro Battery 8000-0860-01 Original Medical battery Zoll Battery Part Number: 8000-0860-01 Voltage / Capacity: 12 Volt 4.2 Ah Dimensions: 168mm (L) x 75mm (W) x 45mm (H) Approx. Weight: 385g Chemistry: Lithium Primary