My wireless sixaxis controller won’t charge or turn on at all

Not matter what I do I can’t get any of my 3 PS3 wireless controllers to charge or turn on.. they are completely dead… they were all fine last time I used them..(few months ago) I have tried everything .. I bought a charging cord, hit the reset button on the controllers, plugged them into my ps3, computer, tv, wall USB no matter what I do I can’t them to turn on they are completely dead.. are they done for now??