Ups is not giving a proper backup

Every UPS has a limit and can only supply power for limited devices only .
when a UPS fails you will have to check for the folloeing things

step 1:
as earlier see if you have connected many devices to the same UPS ,that is more that it's capability.
A standard home use UPS will supply for a monitor , a cpu, a speaker ,a mouse and a keyboard.
Devices such as broadband modems can cause problems when connected to the same ups , since the UPS cannot supply enough power so try disconnecting devices like your modem etc.

step 2:

Check the fuse of the UPS .

step 3:

check the battery of the UPS for leakage or short circuitary .

If every thing seems right then try charging your UPS for a whole day and then try.Then contact your provider.

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