> Is the battery held in by friction and the connector? If so does it ever fall out?

Yea, it's just friction and the pogo pins at the bottom! It took us a long time to get that fit quite right but now it never falls out. I'll give you a refund and let you keep CoBattery if you buy it and can shake out the battery :)

> How do you deal with the lightning port being used the headphone jack?

I actually have the iPhone 7 and I've totally switched to Bluetooth earbuds. And you can actually pull out the connector if you do want to plug in, but it's definitely a better experience to just move to Bluetooth.

We are working on a version of CoBattery that will have an old-style audio jack. But it's tough to source the audio-lightning components!