XS1300 Shows No Errors, Full Battery, 10% load, But Estimated Runtime Is 0

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Ant suggestions? XS1300 shuts down immediately on power failure and shows zero run time. Input voltage is 121v out is 120v 60hz, battery voltage out of unit is 27.1v, load is only 10% 85w. On a power failure it shuts down immediately. Can the batteries be bad but still show 27.1V? Thanks.

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XS1300 Shows No Errors, Full Battery, 10% load, But Estimated Runtime Is 0

XS1300 Shows No Errors, Full Battery, 10% load, But Estimated Runtime Is 0

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