$35 at Amazon
Still the most expensive
Mophie Juice Pack Battery Case
Mophie is a brand that stands behind its battery cases and offers replacements if yours stops working properly. However, I specifically know this because so many Amazon customer reviews for the Not… Slim it down
ZeroLemon 5,500mAh SlimPower Battery Case
Sold on getting a ZeroLemon case but wish they offered something a little less bulky? This is generally a good thing. If you’ve found your Note 8 battery can’t make it through a full day of use anymore, you might want to consider a battery case that will offer you a bit of a boost on the go. You should get the ZeroLemon SlimPower case, a more pocket-friendly design that offers half the battery capacity — but at half the price, too — for those who value good design over pure battery power. Two years out, the Samsung Galaxy Note 8 is still a great device that lets you get more done — as long as you don’t run out of battery life.