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
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The charging circuit may be shorted out (and the noise might be high load coil whine), which would be very dangerous. Dispose of it.
My UPS, Amazon branded, started making a loud high pitched noise yesterday, the homes power did not blink or anything, but it stopped when I pressed the power button and then turned it on again. Now I’m worried about it.