Philips OEM Battery for Philips/Agilent/Laerdal FR-2 and FR-2+ AEDs Long Life Battery, Non-Rechargeable Lithium Ion, Original Part #M3863A
12v, 4.2 Ah battery for Philips Heartstart FR-2/FR-2+ and Agilent HeartStream FR-2 AED Defibrillator, Models M3860A and M3861A.