Some please help me with my Sofirn IF22A!

I've had several of these and they all in the same way. In the picture it is plugged up. If left to charge It will charge to the point it turns from blinking red to green. It will even come. on but when I take it off off the c charger, nothing. Does not work does nothing. No indicator light. Please tell me what's wrong with this? I don't I am buying them. This is my third one. They work great until they don't