Extended Performance Replacement Battery for select Dell Laptop / Notebook / Compatible with Dell Studio 1535, Studio 15, Studio 1536, Studio 1537, Studio 1555, Studio 1557, Studio 1558, KM887, KM898, KM901, MT264, KM958, KW898, MT275, MT276, MT277, PP33L, PP39L, PW772, RM803, RM804, WU946, WU959, WU960 ( 9 Cell, 6600 mAh ) Extended Performance Replacement Battery for select Dell Laptop / Notebook / Compatible with Dell Studio 1535, Studio 15, Studio 1536, Studio 1537, Studio 1555, Studio 1557, Studio 1558, KM887, KM898, KM901, MT264, KM958, KW898, MT275, MT276, MT277, PP33L, PP39L, PW772, RM803, RM804, WU946, WU959, WU960 ( 9 Cell, 6600 mAh )