I have recently dropped my power bank onto the concrete and I haven’t really thought of it and continued using it. It worked perfectly fine but the outer casing just had some damage. Couple days later, it died and I tried charging it. Today I found out that it hadn’t charged one bit and I also noticed that it was making a high pitched hissing sound that was very noticeable but not very loud. This only happens when I plug it in to charge. Should I be worried? Thanks