I'm trying to figure out if reformatting my iPhone 6 Plus would be worth it. I get about 8-9 hours of USAGE (fairly heavy usage) before it dies. I get a fair amount of standby time, so it's not draining while in standby. I have background updates on for a few apps, bluetooth/wifi on, etc... Is this a reasonable life for the phone? Would I get better battery life if I reformatted the device and setup as scratch? What is "normal" for the iPhone 6+?