Stubborn husband has an iPhone 6. The battery is totally dying and the phone only lasts a few hours now. It gets worse every day. He wants to hold out for the 8. I have a back up se and he won't use it instead. My se has a battery case to boot. Can't fathom why he is so cheap...he wants to use an external battery to charge his phone all the time until the 8 comes out...the type that connects with a cable. Insert eye roll. I think eventually the phone is just not going to power up. I was thinking of getting the battery replaced at a non Apple Store shop. How bad is this option. I always have apple care plus on our devices and only take them to apple for help.