Razer Hammerhead BT do not turn on nor charge battery

Help! My Razer Hammerhead BT do not turn on anylonger. I connected them to an USB cable and they don't even show that they are charging the battery. They stopped working while I was at a sport studio and sweated a lot. Probably, they got wet and something is broken. I am out of warranty. Is there another way to resolve this issue or to fix them? Thank you!