My battery is fully charged but mac will not start

The battery is charged but when i unplug the charger the computer turns off.

Hello Monaco,
you can check the performance of your battery in system report under power
apple icon>about this mac>more info>system report>hardware>power
you wil find info like:
Battery Information:
  Model Information:
  Manufacturer:    SMP
  Device Name:    ASMB011
  Pack Lot Code:    1
  PCB Lot Code:    0
  Firmware Version:    a41b
  Hardware Revision:    0
  Cell Revision:    0
  Charge Information:
  Charge Remaining (mAh):    6781
  Fully Charged:    Yes
  Charging:    No
  Full Charge Capacity (mAh):    6784
  Health Information:
  Cycle Count:    1
  Condition:    Replace Now
  Battery Installed:    Yes
  Amperage (mA):    -23
  Voltage (mV):    12535
if your full carge capacity is zero, and the voltage is around 9.7, as shown below,
your battery wont charge nor feed your Mac.
it needs to be replaced.
  Full Charge Capacity (mAh):
0
  Health Information:
  Cycle Count:
1
  Condition:
Replace Now
  Battery Installed:
Yes
  Amperage (mA):
0
  Voltage (mV):
9785
wilfrido

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