I have a UPS problem

Hi, I am new to this wonderful forum, so firstly I would like to say HELLO to all of you. Now I have a little favor to ask, my UPS is actually 800va which uses a 12v 12 amp battery, now its dead and I have to replace it, so my question is, can I use a 12v 7 amp battery with it, will it be a problem? Thanks in advance.
 


Yeah, it is perfectly acceptable to me, as long as it will not create any problem, say the battery will drain out quickly, or the life may became shorter. It only takes a minute or two to shut down the computer in case of power failure.
Thanks for your time and advice.