LG won't charge has ? When plugged in

Mar 18, 2018
2
0
10
My LG has a question mark on the battery icon when plugged in. It won't turn on because the battery is dead. Any ideas to explain what may be wrong will be appreciated.
 
Mar 18, 2018
2
0
10
Thank you for the suggestions. This LG is one that has a non-replaceable battery and I've tried several battery chargers. It was only a month old when this happened.