Phone isnt turning on even after I charged, what is wrong with the battery?

[Android Central Question]

My phone was on 9% so to prevent it from shutting down on me when i was out, I powered it off. Then I tried to turn it back on an hour and a half later but it didn't work. It was able to turn on but just show robin by nextbit page. It stayed like that for about 10 minutes and started to heat up, then turned off. I thought it was dead so when I got home, I put it charge and just left it there. I went to check on it 2 hours later and it still wouldn't power on. What is wrong with it?

 

[belodion]

A diagnosis via a forum is hardly possible. It could be a bad battery, or perhaps not.

 

[Dano1200r]

Have you tried to start in boot mode?