hi, i have apc BE600M1 replace new battery still not working and keep beeping  i check the output not ac voltage

Hi,

Have you reset the UPS?

1: Disconnect any attached load.

2: Unplug the UPS from the wall socket.

3: Disconnect the UPS' internal battery.

4: Push and hold the "On" button on the UPS for 5 seconds

5: Reconnect internal battery.

6: Plug UPS in to known good power source.

7: Turn UPS on.

If that does not resolve the issue you should contact local support. IF the unit is under warranty they will assist with a replacement. 

Local support contact information will be found at this link.

https://www.apc.com/us/en/support/contact-us/index.jsp

You may need to change the region in the upper left of the contact us web page.