GFI&reg; High Performance Replacement Laptop Battery Aluminum Upgraded Version for Apple MacBook 13" A1278 A1280 MB466LL/A MB466 MB771LLA MB771 4200mAh - 12 Months Warranty Battery type: Li-Polymer; Capacity: 4800mAh/56Wh; Voltage: 10.8V; 100% TPE Brand new from manufacturer. Under 100% Aging Test. Up to 500 cycles life, low self-discharge, no memory effect; Dual IC chips provide protection against short circuit, over-discharge, overcurrent.Operation time for standard batteries(6-Cell, 4400mAh): Around 2 hours CE/FCC/RoHS certified for product safety. 24/7 email support, 12-month hassle-free warranty. Use the keyboard shortcuts Ctrl+F or -F (Mac) to quickly crosscheck if your requested model is listed in the Fits Compatible Model List. TPE'S battery makes a perfect coupling with your high-end APPLE battery!