Gizga essentials dell studio 1535 laptop battery: "gizga essentials" manufactures after market replacement batteries chargers & world of other laptop accessories for all major branded laptop notebooks. the all replacement battery is made from brand new high grade lithium-ion cells & highest quality parts. It is 100% compatible to original battery in all terms including its size/ appearance & most important quality. ✔ all products are manufactured in iso 9001:2008 rohs ce/ fce certified facility to ensure the best for our customers. All products are backed with good build quality & aesthetic appeal. comes at fraction of cost as compared to the original manufactures spare supplied. All new battery try a few cycles of discharging to 5%/ then charging up to 95%. Kindly check your laptop compatible devices below list to ensure compatibility/ please cross check if the part number (located at the back of your original battery) is listed in the fits parts number list. ✔ compatible part number: 312-0701 312-0702/ km887/ km898/ km901/ km958/ mt275/ mt276/ mt277/ pw772/ pw773/ rm803/ rm804/ wu946/ wu959/ wu960/ wu965/ mt264. warranty: 2 year warranty on manufacturing defects and failure to perform. Features- • battery type: li-ion; capacity: 4400mah; voltage: 11.1v; cells: 6-cell. • gizga essentials branded 100% oem compatible with original manufacture's device • compatible part numbers: grade a cells ensure fast charges and low power consumption; built-in circuit protection ensures both safety and stability. Best in its class quality at fraction of the price as compared to the manufacturers supplied spares.