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Hi. Back panel is loose but I don't think it has something to do with the battery. Also, the usb port cover is loose. I just had it replaced about four months ago. Please help. Thanks! 
I'm sorry to hear that but since those are hardware issues, you have to contact your Local support
On a side note, did you repaired the phone yourself or through an official Sony Xperia Care center?
Hi @faola, I am sorry to hear about what has happened. 
I agree with the suggestion posted by @uliwooly, I recommend that you get in touch with your Local support in order to be assisted in sending your device in to an authorized service center.
I am very sorry to hear that. I assure you that the service centers do their best in order to repair your device, hopefully you won't experience the same again. 