This Is the High Capacity, extended run battery for the Asus K72 K73 N71 N73 X71 and X77 series of laptops. The letters or numbers that follow the main model number ( K72J) will not make a difference in the battery selection as all the laptops in the family use the same battery and power cord. The Extended Run battery featured on this page will run an additional 1.5 to 2 hours over the standard capacity battery. You can expect This battery to provide 4 to 7 hours of running time depending on your power use. For example, a brighter screen uses more power than a dimmer screen. The battery features lithium-ion cells. Li-ion battery technology provides longer run times with less weight. In addition, Li-ion batteries are not subject to the memory effect common with older battery technology. If you have purchased computer batteries before that sell for less than half the price of ours, you are already aware that those batteries only last 3 to 6 months.Our Xtend batteries are guaranteed to last at least 2 years but often last 3-5 years with normal use.This laptop battery replacement is 100% compatible with the original battery specifications.

You can expect about 4 - 7 hours of run time with this computer battery when new, depending on your energy use.

Like all Li-ion primary batteries, your run time will decline over time.

This battery replaces the ASUS K72 K72JK K72JR K72F series laptop batteries.

Laptop Battery Express only deals with brand new premium computer batteries. We never carry recycled or used batteries. We only use the highest quality cells inside the battery pack so you will have a long service life (300-500 recharge cycles). We do not use cheaper battery cells which can wear out in a little as 6 months. Our inventory turns rapidly and you will always receive a freshly manufactured battery.