Hello, today my battery seemingly died... Help?

Question

hello, today my battery seemingly died and the macbook would not work unless it was connected to my adapter. I did some reading and decided to buy a replacement. However, when I got home later to buy a new battery, my mac would not turn on. Then later on, I decided to check on my mac and sure enough, it miraculously turned on. Now it says that the battery is fine and I can disconnect it and use it like I used to. Should I still buy a new battery, or was it just messing with me?

Answer 1

Battery Information:
  Model Information:
  Serial Number:          D86129404QWDGDLAB
  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):          6277
  Fully Charged:          Yes
  Charging:          No
  Full Charge Capacity (mAh):          6277
  Health Information:
  Cycle Count:          189
  Condition:          Normal
  Battery Installed:          Yes
  Amperage (mA):          0
  Voltage (mV):          12339
System Power Settings:
  AC Power:
  System Sleep Timer (Minutes):          0
  Disk Sleep Timer (Minutes):          10
  Display Sleep Timer (Minutes):          180
  Wake on AC Change:          No
  Wake on Clamshell Open:          Yes
  Wake on LAN:          Yes
  Current Power Source:          Yes
  Display Sleep Uses Dim:          Yes
  GPUSwitch:          2
  PrioritizeNetworkReachabilityOverSleep:          0
  Standby Delay:          4200
  Standby Enabled:          0
  Battery Power:
  System Sleep Timer (Minutes):          0
  Disk Sleep Timer (Minutes):          10
  Display Sleep Timer (Minutes):          150
  Wake on AC Change:          No
  Wake on Clamshell Open:          Yes
  Display Sleep Uses Dim:          Yes
  GPUSwitch:          2
  Reduce Brightness:          Yes
  Standby Delay:          4200
  Standby Enabled:          0
Hardware Configuration:
  UPS Installed:          No
AC Charger Information:
  Connected:          Yes
  ID:          0x0100
  Wattage (W):          85
  Revision:          0x0000
  Family:          0x0085
  Serial Number:          0x001f267b
  Charging:          No