Two telemetry boxes were returned from a nursing unit to the telemetry work station because both of the tele boxes were reported to have overheated and became warm to touch while on a patient.There was no injury to either the patients or the staff.The telemetry technician removed the batteries from the tele boxes and sent both the batteries and tele boxes to biomedical engineering for inspection.Biomedical engineering inspected the tele boxes and found no evidence of cracks, damage, springs were fine, etc.The tele boxes were returned to the telemetry work station and placed back in service as they required no repair.The two sets of batteries, however, did demonstrate signs of overheating (split, melted-appearing covering).The batteries involved were duracell mn1500 size aa.
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