The battery was swelling and wasn't holding a charge very well.
The repair went ok. However the color is a thin film that is adhered to the underside of the back glass cover. The adhesion of the color film is weaker than the double stick tape adhesive holding the back on. The result is that in the corners, the color film comes off the back glass when trying to remove the back glass cover.
I would recommend that you also order a replacement back when ordering a battery.