This LENOVO replacement battery pack is a mAh, , rechargeable, removable, battery designed to work with LENOVO ThinkPad E580 20KS003NUS. The Hi-Quality battery meets or exceeds original manufacturer specifications for the LENOVO ThinkPad E580 20KS003NUS Laptop Battery in quality, durability, and performance. Li-ion batteries do not suffer from the memory effect. They generally last between 300-500 charge/discharge cycles. All laptop batteries are tested for 100% quality control assurance. This battery for LENOVO ThinkPad E580 20KS003NUS includes a one year warranty. We offer a 30 day money back guarantee and fast shipping on all of our products.