20 - 30 minutos
The phone would power off whilst showing high% of battery life left when running apps or checking email, when trying to power it back up, the low battery symbol would appear. Leave it 'rest' for a few minutes and it would power up again....often displaying 80% + battery life!
Very easy repair especially when following ifixit video on youtube.
Just remember to make sure to plug ALL the leads back in, especially the mic!