So I did a quick test with a brand new fully charged 3.0ah battery after 1 hour and 15minutes the the battery went down 2 bars and the light housing was 110 degrees. So let's say a 3.0ah battery gets 2 hours of run time. So I would expect at the minimum 5 hours of run time out of a 9.0.
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I'm thinking possibly maybe even more than that
These are the specs I get off the Milwaukee web site for the 2130 ROCKET light and 5.0 ah battery
Specifications
M18 Rocket™ LED Tower Light/Charger (2135-21HD)
High Mode: 2,000 lumens for up to 4 hours with M18™ XC 5.0 Pack
Medium Mode: 1,300 lumens for up to 6 hours with M18™ XC 5.0 Pack
Low Mode: 850 lumens for up to 10 hours with M18™ XC 5.0 Pack
https://www.milwaukeetool.com/power-tools/cordless/2130-20
The 2135 ROCKET light ac/dc and with charger was spec'd with 9.0 ah battery
cant really compare directly as the lumen for each setting have been increased.
3000 Lumens on high (4 hours of runtime)
1700 Lumens on Medium (8.5 hours of runtime)
900 Lumens on Low (17 hours of runtime)
18 lbs.
Includes M18 Rocket™ LED Tower Light/Charger, M18™ REDLITHIUM™ 9.0 Extended Capacity Battery Pack, and Carry Bag.
https://www.milwaukeetool.com/power-tools/cordless/2135-20