A portable dock for my Nintendo Switch

A quick Google search about the battery and Fortnite… some Redditors were saying they were only getting 2 hours on Fortnite out of their Switch. At least one guy said his day one launch Switch died after 2 hours and 19 minutes of playing Fortnite but his friend’s Switch was still at 41%. All I can say is I regularly get 3+ hours. Is your Switch a launch day model? And do you play BotW? If so, how much battery do you get playing that?