NinjaBatt Laptop Battery for Dell Studio 15 1535 1536 1537 1555 1558 PP33L PP39L WU946 RM803 MT264 WU960 MT277 KM901 MT276 312-0702 KM905 High Performance [6 Cells/4400mAh/49Wh] PREMIUM QUALITY REPLACEMENT NOTEBOOK BATTERY: Bring your laptop back to life with Ninjabatt's high quality laptop battery - Made of high quality materials, top grade battery cells and packed with safety features. TRUE CHARGING CAPACITY THAT LASTS: Every one of our replacement notebook batteries are tested to meet OEM specifications. Our 6 cells Li-ion battery is rated at 49wH/4400mAh/11.1V - true charge capacity that wont let you or your laptop down. SAFETY FIRST: Dont fall into buying cheap and unsafe batteries, our batteries are UL/CE-/FCC-/RoHS certified for safety and packed with a variety of safety features, including short circuit, overheat, and overload protections. HIGH QUALITY COMPONENTS: Our Laptop batteries are assembled from top quality material and circuit boards to ensure durability and performance, our batteries are equipped with grade A battery cells that provide up to 500 charging cycles. 12-MONTH WARRANTY AVAILABLE ON ALL LAPTOP BATTERIES: Were so confident in the performance of our replacement laptop batteries that were including a 12-month warranty with every single purchase. Reliable performance Extended battery life Safe use anytime, anywhere