Running out of phone battery is really annoying, but there are some things you can do to make each charge last longer. An ex-Apple employee has shared six handy tips that will extend your iPhone’s battery life and ensure you’re never left with a dead device. How to make your iPhone battery last longer1. Never charge above 80%Firstly, Tyler Morgan, who used to work at an Apple Store in Los Angeles, said to never charge your iPhone above 80%. Charging the device to 100% every time can damage your battery, reducing how long your phone will last over time. SO COOL: Futuristic new Eye Tracking feat…