Hi Steve, hopefully you may have this sorted by now, if not let's see if I can be a little help as I had the same problem with my hand-held gimbal.
You don't say what firmware your gimbal is running and tbh I don't know how you can find out but if you type into google Alexmoss Simple BGC, you should be able to find his site/blog or a link to the BGC Software page. Download the software and then hook up your gimbal to your P.C and adjust the gimbals power parameters and this should sort it out....hopefully.