I have a X-300 and im having a similar problem where I get lights indicating the battery being exhausted despite the batteries being fresh and new. I looked it up and im pretty sure it's from a faulty capacitor. You might have the same problem, the good news is theres a way to fix it, the bad news is you need to have a screwdriver, and a soder gun, If you do you can follow this tutorial https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjf5d2H9o7UAhUJL8AKHZNhA88QtwIIKDAA&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DQ78czNImCX0&usg=AFQjCNHN5A8ZXfx_IByvehFYHzIW2YjTqA&sig2=Z_Egyp0KzmbUK7CPN1vE-Q If you don't you might be able to send it somewhere to get fixed.