inputs.text: not believe eyes - buying widely advertised used product new trent extended battery imp99d high expectations fact appeared could hardly recharge samsung nexus smartphone twice mildly using time conducted following experiment fully charged battery counted many times could recharge smartphone empty full phone answer 4 times sharp sent letter customer service saying advertised capacity 9900 mah could charge phone battery 4 times 150046000 mah appr 60 9900 mah response item not defective 75 electricity carries transferred devices maybe wrong thinking various devices run days extended battery phone actually cannot easily discharge imp99d less day watching video playing games