Ensure Reliable Power for Your Critical Medical Equipment The dependable operation of your HP, Philips, or Agilent patient monitor, defibrillator, or Ventrassist artificial heart depends on a fully functional battery. This DR-36S/SH-36S replacement battery is designed for these devices, delivering stable 12V power and a high 4000mAh capacity, making it the ideal choice to restore your equipment's full mobility and backup power capability.