So you fit a battery, supplied by A N Other and the monitor fails in transportation of the patient. Not fatal, but the user can no longer monitor ECG, SPO2, NIBP etc. Who is going to carry the can for using a non-recommened battery when the Adverse Incident Report appears?
There have been many threads along these lines of using copy batteries e.g HP Defibs. In this particular case, I recall the alternative supplier claimed that it equalled the original, when in fact a small battery was missing from the construction.
Graham