This LENOVO replacement battery pack is a mAh, , rechargeable, removable, battery designed to work with LENOVO IdeaPad S540-14IWL Touch(81ND/81QX). The Hi-Quality battery meets or exceeds original manufacturer specifications for the LENOVO IdeaPad S540-14IWL Touch(81ND/81QX) 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 IdeaPad S540-14IWL Touch(81ND/81QX) includes a one year warranty. We offer a 30 day money back guarantee and fast shipping on all of our products.