This cable or accessory is not certified and may not work reliably with this iphone

I’m dealing with something similar, not exactly what you guys are dealing with but the same message ( This cable or accessory is not certified and may not work reliably with this Iphone ).. I purchase a 3^rd party Mophie juice pack for my phone and the moment I plug it in I get that ****! Message Ugh! So annoying because the cases that the have available for iphone6 as juice pack i’m not really feeling beside this one. Any advice or tips ?