Chosen Solution
My MacBook Pro was not used for more than 12 months, when I tried to boot up with just the battery there was nothing. I connected the power supply and it booted up. When I did a system check on the power it was reported that there was no battery installed although the battery is still in the computer. How can I solve this problem?
If you still can’t get the battery to respond you’ll need to follow this guide: MacBook Pro 15" Retina Display Mid 2014 Battery Replacement and here’s the needed part: MacBook Pro 15" Retina (Late 2013-Mid 2014) Battery
