Few days ago, I have wonder my Nexus4 has going hotter and back has exapnded like pregnant. And I can sens it is cause of internal battery life has the end. So I unscrewed double screws on bottom of Nexus4. Open up back cover with plastic openning tools, then I can see sudden death battery.
If I has continue to charging this dead battery, it will blow and my Nexus4 may damaged. Dead battery is always prblem of all devices of has internal battery that si covered with plastic, metal or glass shelter.
Nexus4 fixed battery with adhesive tape like iPhone. You will be need something more safe tools like plastic scoop to remove battery from adhesives.
Replaced battery is need to be charged in fully overcharged in more times to reach 100% in power off. It is different with displaying on Android state bar. If you doing replacement like me, Just powered with charger and turn your phone down. Then wait for enough hours while battery display reach to 100%. Don’t unplug charger it just changed to 100%, you may need more hours for overcharged to reset battery chemical reaction.