Have you installed iOS11 ? I'm running the last PB on my iPad Pro 9.7" and I'm already getting great battery life.Think a big reason why I got such good usage is I work 7am to 7pm so I use it when I get home and don't need to charge it and don't use it during the day but still I've used it all day today and I have 40% left and it's 8 hours usage and 9 hours standby