Testing ME equipment powered by Battery


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Could someone provide any information how leakage current measurements are performed when ME equipment is battery powered?
Battery voltage is up to 3.7 VDC and there is no possibility to use it on patient when it's in charging mode (because input is the same for charging and as patient input connection).
All measurement diagrams (in standard) are made for ME equipment which is powered by supply mains. Or should I measure everything like it was intended to be powered from supply mains?
Thank you for your answers in advance!

EDIT: found the answer in cl. - ME equipment leakage measurement is the same no matter what the supply is (mains or internal).
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