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Hi @Jess1111,
Welcome to the community,
Sorry to hear about that, can you clarify if the handset charges as per normal when on charge via a wall socket and PC or does this only happen with the Power Bank.
If it is only the Power Bank then this is likely related to the third party device then the handset, it may be worth contacting them directly.
Let me know how you get on.
It may not be faulty, however, it may just not be 100% compatible the manufacturer will be able to provide more details in regards to their product and what it should work with.