Battery going mad. Is that the end of my phone?

[Electric Sheep Dream]

I have a Galaxy Nexus, Android version 4.3
Recently my droid started doing some weird things:
- battery draining much quicker than usual (screen being still the most energy consuming)
- while connected to a charger it will either:

- not charge at all unless switched doff​

- charge but not display that it is charging until disconnected from a charger​

- display charging icon but after being disconnected battery drops down to 5%​

- when battery low the warning message will pop out every few seconds
- while switching off it will switch back on at the last second showing battery low message
- screen keeps waking up every few seconds
- gets hot while kept in a pocket

Not all symptoms appear at all times. It's really random. I thought it might be the battery but I bought a new one and nothing has changed.

Has anyone else experienced similar issues and perhaps found a solution? Or is this the end of my phone?

 

[B. Diddy]

Welcome to Android Central! Check the battery contacts in the phone, and make sure they're clean.

 

[Electric Sheep Dream]

Thank you for a warm welcome!

I have checked the contacts - they are in immaculate conditions. I did clean them regardless just in case. It seems that they were not an issue - the problem still persists.