BRTONG Battery for Dell Studio 1535 1536 1537 1555 1557 1558 Pp33l Pp39l 312-0701 Notebook Battery - 12 Months Warranty High Performance 7800mah 9 Cell 11.1V Blcak Laptop Battery for Dell Studio 1535 1536 PW773 WU946. Pls study the product desription below to make sure your original battery and laptop meet the compatibility of both the part # and models. Compatible Models: Studio 15 Studio 1535 Studio 1536 Studio 1537 Studio 1555 Studio 1557 Studio 1558 Compatible part number: 0KM887 0KM898 0KM901 0KM958 0MT275 0MT276 0MT277 0PW772 0RM803 0RM804 0WU946 0WU959 0WU960 312-0701 A2990667 KM887 KM898 KM901 KM958 MT275 MT276 MT277 PW772 RM803 RM804 WU946 WU959 WU960 Operation time for standard batteries: Around 3 hours, the actual operation time will depend on how much electricity is required by the device and how you use it Overcharger and Discharger Circuit Protection, CE-/FCC-/RoHS-Certified for safety, About 500 recharge cycles over the life of the battery. 24 x 7 email support, 12-month hassle-free warranty