Why my battery has died after 2 months of usage, twice?

Hello there,

I’ve bought these headphones a year ago and it started having cracking noises after 2 months of usage. When I connect them with audio cable, they work perfectly, however, when I turn the bluetooth on, weird noises start. I had a replacement unit and the same thing happened again, but even worse. I’ve been using them for 2 weeks and when it came to charging, I wasn’t able to charge them up. When I try to turn them on, cracking noises again, however, once they’re connected with audio cable, everything works normally, so I came up with the answer - battery. Can I replace it somehow?

Best regards!