Battery backup. How long will it run?

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Patis55

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In getting ready to set up my tank i will need a battery back up as i few times a year i will lose power a few times a year. Usually for less then a hour but has been up to 6 hours.
I will need it to run a return pump that draws 55W and a 150W heater when the power goes out.
I have a APC sua1500 power supply that needs a new battery. I will hack it to work with a AGM battery(very easy to do).
The battery im looking at has 140RC and will last 15.5 hours with a 5amp draw according to the specs.
Im pretty sure this should be ok but i want to know for sure so asking you guys.
Thanks
 

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