1.Bay Valley Parts High Performance Laptop Battery for Gateway MDJ7820u Acer AS07B31 AS07B32 AS07B41 AS07B42 AS07B51 AS07B52 AS07B61 AS07B71 AS07B72, Aspire 5920 5315 5520 6930 7520 7720 Battery type: Li-ion; Capacity: 56Wh; Cells:6-cell; Voltage: 10.8V;Capacity:5200mah. High quality grade "A" cells. Charges quickly. Longer discharge time. Steady output and low power consumption. More than 500 times charge-discharge cycles.All products are Certified by CE ROHS UL1642 FCC for safety. Operation time for standard batteries(6-cell 5200mah): Around 1-2 hours the actual operation time will depend on how much electricity is required by the device and how you use it. 24 x 7 email support 12-month service. Compatible Models: For GATEWAY MC24 Series(All) GATEWAY MC26 Series(All) GATEWAY MC73 Series(All) GATEWAY MC78 Series(All) GATEWAY MD24 Series(All) GATEWAY MD26 Series(All) GATEWAY MD73 Series(All) GATEWAY MD78 Series(All) GATEWAY NV73 Series(All) GATEWAY NV74 Series(All) GATEWAY NV78 Series(All) GATEWAY NV79 Series replacement notebook laptop battery batteries 12-months hassle-free warranty service. Please check if this battery is compatible with your computer before purchasing. Part numbers of compatible batteries and Computers are listed as following.