The razer hammerhead pro hyperspeed charging case is no longer keeping a charge for as long

I had my earbuds charging yesterday and they were green before I unplugged them and went to bed (maybe close to 12am). I then try using them at around 10 to 11ish and the case was dead. The earbuds had some charge gone too? Like 90 on the left and 80 on the right. I might have used them earlier and was not paying attention. They also go from full green down to yellow after having an earbud out for 30 minutes and putting it back to charge. Regardless, they are out of warranty. Honestly, I’d rather purchase a new charging case for my earbuds than have them repaired. Is it possible to purchase the charging case officially or do I need to send the charging case to razer to have it be fixed? I should also add: I have been using a wireless charger more recently. Could that have caused the battery to die faster?