Mga sirs,madams,,,need your help,,i bought a new MBD80 batt pack for my d90 and used one original nikon battery on one slot and one generic battery on the other slot but the problem is when the generic battery run out of power(na drain na)dili na ma ON ang camera kung naa ang drained generic battery sa slot so i removed the drained battery out of the slot and then ni On balik ang camera.,,,murag di man ni normal

?what do you think? diba ang purpose sa batt pack is to have atleast continous power on your camera incase na ma lowbatt ang usa naa pa lain,,,,i need your inputs please,,,thank you guys