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
Y740-15 battery swap achieved! : r/Lenovo
New Genuine L17C4PG2 Battery L17M4PG2 for Lenovo Legion Y730-17ICH Y740-17ICH 791315619871 | eBay