The battery of my macbook pro is not working

my battery is not working, just an "X" on the battery signal...
it dosent charge, and it makes the fan work really hard

Which model MacBook Pro do you have (e.g., "15-inch Late 2011")?
Hold down the option key and go under the Apple menu and select "System Information..." Under "Hardware">"Power">Battery Information," copy and paste the text therein. It will look something like this:
Battery Information:
  Model Information:
  Serial Number:    D8620260152DGDLAF
  Manufacturer:    SMP
  Device Name:    bq20z451
  Pack Lot Code:    0
  PCB Lot Code:    0
  Firmware Version:    406
  Hardware Revision:    2
  Cell Revision:    158
  Charge Information:
  Charge Remaining (mAh):    6342
  Fully Charged:    Yes
  Charging:    No
  Full Charge Capacity (mAh):    6370
  Health Information:
  Cycle Count:    165
  Condition:    Normal
  Battery Installed:    Yes
  Amperage (mA):    -1
  Voltage (mV):    12496
You may show that a battery is not installed.
Clinton

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