My backbeat fit has been having trouble charging

Hi, i’ve been using my backbeat fit series 500 for about a month now, and when i plug in the charger the light turned on showing that its charging but when i connect the headphones, the percentage hasnt gone up and has stayed the same from when i plugged it in, im very worried theyre broken, and i had trouble finding an solution for this, if anyone could help me out with this, i would appreciate it, thanks!