Plantronics backstreet 903 will not charge the red light will not continually stays red

It sounds like the Plantronics Backbeat 903 may need to be reset. This is the link to the User's Guide. You can try that option.

Good luck from Headsets Direct!

In my case it was the answering button that was stuck. I opened the speaker removed all the rubber parts and deeped the speaker with the board on alcohol. The used a air can to blow out all the alcohol and dirt out of it. Afther that it wasnt working so with a knife I pushed one of the sides of the answering button up (just a little like 1mm) it started working like before . It powers up and all buttons work now. I'm no technician. Just startet tempering with it and go it working. Hope this helps.