My advice: just go buy this exact one:
https://www.amazon.ca/gp/product/B07FC9JXHQ
It works flawlessly, has no battery-drain issue, and feels great in the hand. Unlike some other third-party covers (I've tried several), it has a nicely rounded, rather than sharply crimped, edge, so it doesn't dig into your palm, and unlike some other third-party covers, it has no exposed metal plate. This is the best third-party cover I've had for ANY Kobo, and I've had many different models. I've been using it for fourteen months now, and it's showing zero signs of wear.