I have 4 TB48 batteries. My 2 old ones are showing stress fractures around the area where it clips into the battery bay to the Inspire. One of batteries is worse, the crack is right through the plastic. Still a small crack, but it made it's way through the plastic completely. It does clip fine into the Inspire. Just worried it may fail and the battery will fall out during flight. What glue is safe for plastic? I want to repair these cracks. Thanks in advance.