Asus U57 and U57A Series This brand new ASUS replacement laptop 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. This laptop battery replacement is 100% compatible with the original battery specifications and is individually tested and backed by a 2 Year warranty. Tech Specs Xtend brand; 11.1 Volts - also compatible with 10.8 Volt systems; 4400 mAh or 49 Whr; 6 Cell Li-ion; Samsung (South Korea); Dark Grey; Assembled in China; 2 Year Warranty; 30 day full satisfaction guarantee; 300-500 recharge cycles; You can expect about 2 - 3 hours of run time with this Asus U57 battery when new, depending on your energy use.
This U57a battery replaces the A32-K55, A33-K55 and A41-K55 laptop batteries. Replaces these many
ASUS battery part numbers: A32-K55A33-K55A41-K55