Lenmar Li-Ion Battery for Palm Treo 600 3.7V 2000 mAh Fits Handspring Treo 600 This Battery May Require Skilled Installer Or Special Tools Fits Handspring Treo 600 3.7V 2000mAh Lithium-Ion 2 Year Warranty Warning: This Battery may require Skilled Installer or Special Tools to Replace. For Skilled End Users Only.