on a battry mode why this happen

[anishthakkar]

On the battery mode back side of the UPS, I checked with the Tester (the Bulb Analog Voltage Pocket Pen) L and N both sides tester's bulb illume Is this okay? or not?; I have another same UPS checked it same situation in both UPS. Is this natural or faulty I cannot understand it please tell me.

I do not know how can I explain this in English; So I request you that please please please see my attachment. PFA PFA PFA 

[Teken]

I’m not 100% sure what you’re asking so will take a wild guess. 

Question: Should I see (AC) voltage at the output when on battery power only?

Answer: Yes

Let me know if that answered your question if so mark this as solved. If not please do ask again so we can try again! 👍