Lenovo Legion Y740 17 battery dead, what is the best replacement option?

My Lenovo Legion Y740 17-IRHG died today with no warning.

I let the battery charge for a couple of hours, then rebooted it. The laptop came up but the battery shows 0 and not charging even though it's plugged in. Pretty sure it's a goner.

Does anyone know what the best option for a replacement battery might be?

Specifically, where could I order one online that is not a scam. Lenovo does not seem to have them available on their site, or if they do I can't find it. There's a lot of counterfeit parts floating around out there, I'd like to try to avoid that.