Arekkz decided to test the battery life for himself, and it took three hours, two minutes and 52 seconds before the system shutdown.
Settings he used:
(=^・ω・^=) Kuroneko S2 - Ore no Imouto - Steam, MyAnimeList and Twitter - PSN: Gustavo_Valim - Switch FC: 6390-8693-0129 (=^・ω・^=)