I think you may have had a bad one. I plugged in my phone last night with the case together to charge both. Case had about 50% charge left and phone had about 85% left. Anyways. It charged my phone first and then it fully charged my case. When I woke up both phone and case are at 100% charged. I didn't have to mess with it or push any buttons.
Before I bought it I read a lot of Amazon reviews and seems like out of the 82 reviews or so, around 5-10 were very bad. Those I think got the bad not working cases. Unfortunately you may have gotten a bad case too.
For me this case is great. Does exactly what it's supposed to Isn't very heavy at all (I don't even notice anymore. Guess I'm already used to it after one days use). And the battery life on the case is way more than mophie is offering for the 6 plus. Overall I've very happy with this purchase.
Now that you have had more time to use your case, how is the charging going? If you plug the phone in, will it still charge both the case and phone overnight? I am really tempted to give the case another try. I have a phone suit preordered, but it's $30 more so I might give the iBlason another try first since the phone suit isn't out yet.
Oh and another question. When you unplug the case from the charger, does it automatically start charging the phone? Mine would. I am just curious if that's how the phone works, or if that part could have been malfunctioning on my case as well.
Thanks!