sup /wsr/

I have an Atrix 2 phone that I've used for half a year now, but it stopped charging quite a while ago. I tested lately and it went from 10% from 5% with the same charger that I always used for it. Thankfully, I had another cracked Atrix 2 that charges batteries to keep it alive. Is there any solution to the problem with the one I use?

Thanks in advance.