I'm using Mintyboost v3, and my iPhone 5 is charging so fast that it is making the inductor start squealing after a minute of charging (I tried hot gluing around it but it only muffled the noise a little), and the chip is getting hot almost as fast as a shorted out wire.
In addition to that, I tried charging it for about 10 minutes and my Eneloop batteries got so hot that I had to immediately unplug my phone. The batteries were too hot to touch, and my phone's battery had gone from 28% to 40% in only 10 minutes.
Is there any way I can limit the current output of the chip? I put some hot glue on the chip to try and pull heat away from it, but its melting the glue off as I type this. I could try thermal paste & a heatsink next, but I only have so much space available in the tin.