A system for alerting a patient includes a ventricular assist device (VAD), a battery, and an alarm system. All of these components of the system are configured to be implanted within the patient. The implanted alarm system is configured to provide an alert to and from within the patient based on a condition. The alert can be a vibration or an electrical shock, and the condition can be the implanted battery being below a threshold, a failure of the implanted battery, an error of the implanted battery, or an error of the implanted VAD.