we have received mail from the UPS but i can't understand mail content

[Anonymous user]

Dear All,

What is meaning this alarm (highlighted), please explain to us?

[BillP · Accepted solution]

This means that the UPS detected a battery but it was not installed properly. This can mean that the battery voltage dropped and it looked like the battery was missing or there was another battery related problem. If this just happened once, I would not worry but if it keeps happening consistently, you should verify the status and health of your UPS batteries.