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57Y4559-AA is a Lenovo compatible 6-Cell LI-ION 10.8V 5278mAh battery specifically designed for Lenovo notebooks. This higher capacity 5278 mAh battery packs more punch than the OEM and has a similar form factor to the OEM.
Addoncomputer.com batteries are 100% tested and compatible for the systems intended for. Battery life depends on many factors including: available DRAM, screen brightness, applications, features, power management, battery condition and other customer preferences. AddOn part numbers mimic the OEM, and are comparable in form factor and battery life. With the ADDON CERTIFICATION TEST Program, your product will work right the first time.