phone only shows signs of life when connected to a battery pack?

so i made the mistake of letting my phone die completely about 3 weeks ago. It hasn't turned on since, and it isnt recongizied by a computer or any charger i own, but it starts to make a quiet ticking sound using a battery pack, but it still doesn't boot in boot mode or just normal startup. it can't turn on without or with a battery and the led doesnt flash. is the phone dead or does it still have a chance?

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