The working is as expected when the Arduino is powered via USB the battery should be sufficient to power the module. Am I missing something?
Did you ever get it solved?
too much current even for a fresh alkaline 9V.
Does it work properly otherwise
The working is as expected when the Arduino is powered via USB ...... All other components connected to Arduino work with the battery, except the bluetooth.
For the hell of it, I just tried powering my project, a weather station, using just a 9V battery. And not even a totally fresh one, as it registered 8.95v on my multimeter. Yet it worked, including the HC-05,........I've pretty much just proved that
This is not to say that they're a smart way to power an Arduino project,
In fact, the lower power actually made for a good worst-case test scenario. If I can design a node robust enough to work off a not so fresh 9V, it should be more than reliable with a more robust power supply.