Problems with my battery life.

I have had my macbook since 2009, usually i get a good 3 hours on the life depending on what I am doing but lately it has been going a little weird. My battry life will go brom 99% to 14% and then back up to a 50%. Then comestimes when I put my laptop to sleep and wake it up again it will say 0% but still run for half an hour or so.... help?
Here are some of the specs of the battery:
  Device name:          ASMB016
Charge Information:
  Charge remaining (mAh):          1558
  Fully charged:          No
  Charging:          No
  Full charge capacity (mAh):          3608
  Health Information:
  Cycle count:          1373
  Condition:          Fair
  Battery Installed:          Yes
  Amperage (mA):          -1446
  Voltage (mV):          11227
Help?

Your battery is well above the 300 cycles that an ASMB016 is considered good. http://support.apple.com/kb/HT1519
You can get a new third party battery fairly cheap on eBay. Every MacBook from 2006 through Mid 2009 except the Late 2008 Aluminum Unibody and the Late 2009 and 2010 White Unibodies use the same A1185 battery.
White Batteries http://shop.ebay.com/i.html?_nkw=macbook+white+battery&_sacat=0&LH_BIN=1&_sop=12 &_dmpt=Laptop_Batteries&_odkw=macbook+black+battery&_osacat=0&_trksid=p3286.c0. m 270.l1313
Or for $129 from The Apple Store  http://store.apple.com/us/product/MA566LL/A?mco=MTY3ODQ5OTY

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