Batteries should be adhered in some fashion to prevent them from jostling around inside the device and disconnecting their cables or, worse yet, damaging another part of the device. I'm not entirely sure about the bevel but if it was originally adhered, you'll want to try and get it back on in a similar fashion.
As for the adhesive, you have a few options. You can buy some jewelry glue like B-7000 and carefully apply it to the components that need to be adhered and just let it cure. Alternatively, you can use “the red tape" and just cut it to size (look on Amazon for “phone red tape" and find one about the thickness you need).