Review on iPad/iPhone USB Adapter by Bqbersyn - Lightning to USB3 Female Adapter for Fast, Easy Connection! OTG USB Female Adapter for iPad/iPhone - Supports USB Flash Drives, Mice, Keyboards, Microphones, and MIDI. Simple Plug and Play Setup! by Scott Lavimodiere

This is a working solution for USB microphones that require phantom power. Connecting the charging cable prevents the battery from draining while recording on iPhone, iPad etc. In the photo I'm using a Nessie "Blue" microphone. * I couldn't record a video because my iPhone would be connected to it. Bottom line - it works and is (much) cheaper than a branded product of the same color. If it proves durable as well, I'll check again later.