Hi I have iPhone 6. Battery life really poor (probably cos age my iPhone now). I take my iPhone off charger 6am and use it about 15 minutes morning before work then use it couple times office in morning and battery go down around 50% before lunch time then I have put on lower power cos it will die about 1-2 hour later. Low power help last until end working day. I wondering if Apple do battery diagnose test and if it fail would it be worth get new battery so later year can sell it get new iPhone or deal with it now and sell iPhone with poor battery after get new iPhone? I not too sure because it first time have same iPhone over 2 years.