You can expect about 2 hours to 2-1/2 hours of run time with this HSTNN-139C battery when new, depending on your energy use. The higher capacity battery cells inside this cartridge have an
energy capacity of 5200 mAh. This battery will be compatible with batteries rated at 4400 & 4800 mAh capacities while providing up to 20% more run time.
This HSTNN-139C battery replaces the HP 550 6530s 6531s 6535s 6720s 6730s 6735s 6820s 6830s series.