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If it's dead and hot, then you most likely have either a bad battery, or a defective charging circuit.

I'd start with replacing the battery (or swapping batteries between the 2 handsets, and see if the problem follows the battery)

If the battery change does not help, try on the other charger base (if you have one), and if that still doesn't help, then the handset itself is defective and will need to be replaced.

I see you've left negative feedback for my answer. I apologize for being the bearer of bad news here, however based on your description of the problem this is a hardware defect, which is of course beyond my control. This does not diminish the quality or accuracy of my answer, though I understand your frustration with having a piece of equipment that has gone bad or may need to be replaced. Please know I am an independent tech, not a seimens or justanswer employee, and your positive feedback is how I make a living. I have spent my time in good faith to provide an answer to your question, and am happy to continue working with you if you'd like further information on this, just let me know. Otherwise, I would appreciate you re-rating my answer with positive feedback, in recognition of my time and expertise.

Thank you,
Nathan