While attempting to take a scheduled blood pressure reading for the patient the bedside monitor displayed a "replace battery immediately" error message and would not allow the clinician to take a blood pressure.The monitor was plugged into ac power, but the error message caused the bp monitor to freeze and not allow any user interface action.Monitor was removed from service and sent to biomedical for evaluation.Biomedical removed the rechargeable battery pack and pressed the self check key and noted that the battery charge indicator showed 100% charge.Re-insertion of the battery back into the monitor created the "remove battery immediately" message.A new battery replacement was inserted into the monitor with no additional error messages.This was the second incident of this type of failure in the last two weeks on the same model and age of monitor about 11 months into service.The battery lot numbers were the same on both batteries.These li-ion batteries were to have a 36 month service life.Manufacturer response for battery, li-ion 11.1vdc, 7.8ah, molicel (per site reporter) manufacturer to arrange to have battery analysed.Manufacturer response for monitor, vital signs, suresigns vs4 (per site reporter) manufacturer to assist in determining cause.Batteries help for their analysis.
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