apple watch won't charge or restart

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https://support.apple.com/en-gb/HT204640

I am having the same problem. My IWatch went dead because I did not have a charger and now it shows that a charging symbol yet overnight on the charger it did not hold a charge and it is quite hot. What do I do?

Sometimes I see a green charging arrow in the upper left corner with small time characters and sometimes I do not see anything. At one point I saw a thermometer.