High Performance Laptop Battery for Gateway MDJ7820u Acer AS07B31 AS07B32 AS07B41 AS07B42 AS07B51 AS07B52 AS07B61 AS07B71 AS07B72, Aspire 5920 5315 5520 6930 7520 7720 - Long Life, 24Months Warranty 6 Cell High Performance laptop battery for Acer Aspire 5520 5920 AS07B31 AS07B41 AS07B51 AS07B71 Gateway MDJ7820u MD7801 Battery type: Li-ion; Capacity: 5200mAh; Cells: 6-cell; Voltage: 11.1V (Compatible with 10.8V) Full compatible with your original battery, brand new direct from Professional Manufacturer. Not for Acer Aspire 7740 Battery Operation Time: Around 4~5 hours. The actual operation time will depend on how much electricity is required by the device and how you use it Buy with confidence! General 5200mAh batteries only last 2~3 hours, to ensure our customers have 4~5 hours operation time, Tree.NB laptop batteries include only the highest quality battery cells and components. We are passionate about excellence so that with every Tree.NB brand purchase, you can expect to find quality materials, high performance, affordable price!