I was out tonight testing IOC in My usual field. I was under the impression that the transmitter would charge up the phone/tablet. Made the charge up noise, but I got the message 'battery under 10%' and it died soon after that. No big issue as it was only a few feet away and I could bring it in safely, but if the Tx was charging it, there wouldn't be an issue. Tonight I was using my iPhone 6 instead of the usual iPad as it was just testing. Btw, IOC works fine. Exactly the same as the P2s.