Gateway MD78 6600mAh/98Wh 12 Cell Li-ion 14.8V Black Compatible Battery Gateway MD78 6600mAh/98Wh 12 Cell Li-ion 14.8V Black Compatible Battery Compatible for Gateway MD78 Each battery was tested at an original laptop by the manufacturer. High Capacity Replacement battery with 1 year warranty. mwave is the only authorized reseller of mwave batteries. Expedited Shipping Available. Buy with Confidence