This ASUS replacement battery pack is a mAh, , rechargeable, removable, battery designed to work with ASUS S551LN-CJ149H. The Hi-Quality battery meets or exceeds original manufacturer specifications for the ASUS S551LN-CJ149H 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 ASUS S551LN-CJ149H includes a one year warranty. We offer a 30 day money back guarantee and fast shipping on all of our products.