Android phone not charging and going to download mode

[Android Central Question]

My android samsung galaxy prevail phone will not charge anymore, I have tried new cords and adapters. I turned it off and tried to charge it. But it would turn on. After a few times it went into download mode. After I left that it started to charge again. Now it needs to charge but it won't work. It's still stuck on 25%. What should I do??

 

[B. Diddy]

Welcome to Android Central! The battery is probably failing -- have you already tried a new battery?