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Thank you for taking time to provide feedback about our BN1500M2 unit. Batteries of this unit is 24 v 9 amps around 216 watt hours. Typically aside from load there would be other losses due to conversion inefficiency sensor of unit as well will only predict runtime if load is around 10% 90 watts. It should be able to power it for more than 5 hours approximately. Here is graphed data from our testing of brand new batteries on a new unit https://www.se.com/us/en/products-runtime-graph/BN1500M2/apc-backups-pro-1500va-tower-120v-10-nema-515r-outlets-lcd-1-usb-type-c-+-1-usb-type-a-ports/ If you have other questions We offer email and chat services through our support site. You may also contact us directly at 800-800-4272 option 4 or visit https://www.se.com/us/en/work/support/ and look for the chat icon available from 8AM-8PM EST.
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