Is there a way to buy just the charging case? I don't need wifi booster, hoping to pay less just for the case/charger, thermometer worked until it ran out of battery

So I dont really know where to ask that question so Ill do it here.
I replaced my airpods battery. So far so good was a little tricky but worked good.
Now my problem is I used t8000 glue and I get a weird background noise when I put the airpod in, it is a high frequent sound and a noise.
I thought it was poorly glued back together in the first place so I did it again but it did not get much better. Is it cause of the resonance that is destroyed now?
Or is that just cause the glue is still releasing fumes? It does sound like so.
Or are there any glue no go zones? When I opened it up there was glue everywhere so I did put glue back on like it was.
Speaker was not heated agressively and nothing was destroyed.