TechOrbits New Laptop Battery for Dell Inspiron 1525 1526 1545 1546 1750 1440 PP29L PP41L, Fits P/N X284G M911 M911G GW240 GP952 RN873 K450N RU586 C601H 312-0844 - 3 Years Warranty [Li-ion 6-cell] Battery type: Li-ion; Capacity: 4400mAh; Cells: 6-cell; Voltage: 11.1V. 100% New from Manufacturer; Up to 500 recharge cycles over the life of the battery; TechOrbits is the only laptop battery brand to offer a 3 year warranty CE-/FCC-/RoHS-Certified for safety; 2 hour email response time 24/7; the friendliest support on the planet Texas Instruments main board inside for fast charging;double overcircuit protection for extra safety Operation time: standard 4400mAh batteries provide about 2 hours of operation time; the actual operation time will depend on hardware/software being run as well as power management settings and the laptop's energy efficiency