Legion Y740, 4 to 5 hours battery life under use. After updating bios, enabling hybrid graphics mode, undervolting cpu by 155 mV and setting screen brightness to 50%. : r/Lenovo
Lenovo Legion Y740 Gaming Laptop Review - IGN
Amazon.com: Lenovo Legion Y740-15IRH Gaming Laptop, 15.6" Screen, Intel Core i7, 16GB Memory, 1TB Hard Drive/256GB Solid State Drive, Windows 10, 81UF0001US : Electronics
Battery for Lenovo LEGION Y740-17IRHG-81UJ0025MZ | Lenovo Battery Shop