Hi D Wax,
I am inclined to think that the charger was not working. try reconnecting the leads. You should see the charging indicator working if all good. If not then the connections may need attention, or the fuse is blown.
More information will help us to help you!
Most chargers turn off when charge completed. Its normal for the phone to feel warm during or when finished charging.
I have come across some usb leads that dont work, you may need to try another lead...
Cheers,
ausmec101