Telemetry device gave a "replace battery" notification at approximately 0416.A page was sent to the floor to replace the battery.Per the nurse on the floor, the battery was replaced.At approximately 0535, the monitor gave the same notification to "replace battery" for the telemetry unit.The floor nurse called telemetry and spoke with telemetry supervisor.He informed the supervisor that the batteries had been replaced in the monitor and when he went back to check the telemetry unit, he noticed it was hot to touch.He opened the battery compartment to find the batteries were "melting".Telemetry supervisor advised nurse to immediately send the unit to the telemetry department.Upon inspection by telemetry supervisor, it was found that the monitor was overheated.It was taken out of service and replaced with a functioning monitor.The monitor had been on the patient for four days before the overheating occurred.No patient harm occurred.
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