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As was the case with the 15R, the 17R was unable to complete the MobileMark 2007 battery like dell 1G222 battery , dell BAT3151L8 battery , dell Latitude X300 battery , dell W0465 battery , dell Inspiron 2000 battery , dell Latitude LS battery , dell 2834T battery , dell 4834T battery , dell Inspiron 1520 battery , dell Inspiron 1521 battery , dell XPS M1350 battery , dell Inspiron 1318 battery test. Instead, we ran our comparable 10-hour DVD rundown test, which yielded a mere 2 hours and 55 minutes of battery life. That's significantly shorter than the 15R (4 hours and 29 minutes) and light-years shy of the 9 hour 33 minutes of MobileMark battery life we got from the HP Pavilion DV7-6b55dx.