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
Battery life & temperature : Lenovo Legion Y740 (9th Gen) review: A gaming laptop that looks all business - HardwareZone.com.sg
Xtend Brand Replacement For Lenovo L17C3PG2 Battery for Legion Y740 Y540 Y530 - Newegg.com
Lenovo Legion Y540-15IRH Battery
Amazon.com: BOWEIRUI L17M3PG2 L17C3PG2 Laptop Battery Replacement for Lenovo Legion Y730-15ICH Y740-15ICHG Y740-15IRH Y740-15IRHG Series 5B10Q88557 5B10W67295 L17M3PG2 5B10Q88560-Middle Line : Electronics