Estimated Battery Time Inaccurate

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I recently inherited a used Back-UPS NS 1250, Model BN1250G that needed new batteries. Replaced with 2 Power-Sonic PS-1280-F2 batteries. Device seems to work fine except the remaining battery time shows 13% when fully charged but with no load. In order to test it, I plugged in a 150W light bulb, unplugged the UPS from the AC outlet, and the light stayed on for about 45 minutes. Is there a way to recalibrate the UPS to show an accurate remaining time?

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