Hey sorry to be such a bummer but which app are you using to use ur phone as a controller. My opinion on your question is that bluetooth wd logically thinking here, bluetooth wd use more power. As a usb cable plugged in your phone wd or shd be charging at the same time. If u finding it difficult to tell maybe the usb port is not pushing out sufficient charge power. I wd then maybe plug into a normal phone charger and use bluetooth. I find if I use a bluetooth controller eg androg I put my phone in flight mode and then turn bluetooth on and my battery lasts longer because the phone is not continously searching for network when signal is low. But via usb ur shd be charging and via bluetooth no wires connected ur obviously using power. And wireless devices that communicate with each other tend to use power at a faster rate. If using as game controller over bluetooth maybe disable the vibrate function if it has one. Thats my personal opinion so if u dont mind cables then usb the phone... I dont mind bt via my s3 its convenient and its not like im gna play nonstop for hours on end. But id rather have a charged ohone shd I nd to up and leave all of a sudden... best of luck... whats the usb controller app?
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