Its ok but you going to have to charge it every day.
I got about a day on a charge with 35%-40% left vs my Note 4's 3-4 days on a charge.
Side Note:
The Note 4 is not really that big to be honest. Used a Moto G3 Sony Z2 and iPhone 4 before so wanted something in the 5" range that why I bought the Mi5 as my primary. The Note 4's battery surprised me so much and the actual phone size was about the same size as my Moto G + flip cover so it became my primary. I had to give up the flip cover to keep size small, opted for a
thin solid cover with texture and it works for me.