I build computers, this being the case, i occasionally come here for information as well as tools.
Answer to "Broke charging port inside the case.."How... Did you manage that? And to answer your question, look online and you should be able to find a replacement. It's a standard port, so with a bit of soldering, you should be able to swap it out. I am not liable for any damages you do to your own devices. Attempt my fix at your own risk
Answer to "How to remove the ear cups to change battery?"It's actually very simple. I was trying to fix a similar problem on my pair, after doing a complete tear down, figuring it out as i went, i figured it out. Simply twist the ear pad on the right ear cup off, then remove the three small Phillips screws. After that you have direct access to the battery and can unplug, and replace at will