HeartStart Defibrillator Replacement Battery Long-lasting Indispensable 4 year warranty Spare or Replacement Battery – This battery can be used as a spare or replacement battery for Philips OnSite AED (M5066A) Shelf life – this battery has a five-year shelf life plus a (typical) four-year installed life Carry a spare – it is recommended that you carry a spare battery with your defibrillator SKU: M5070A Price: $189.00 Quantity: