please help me with wireless data not working

HI
thanks in advance!
the problem: Have a IMu 9 degree of freedom board from sparkfun LSM9DS1
and a Arduino micro with an xbee and a 9v batt.

serial data does not work when I have the cricuit power with a battery ( also have a 5 volt voltage regulator power the arduino )

if I use the usb port the serial data works ( GREEN led on TX blinks )

I have tried to use also an UNO and have the same issue.

any advice please.

If you mean a PP3 style 9v battery then that is not suitable. It can't provide enough current. Consider a pack of 6 AA cells.

...R