Battery Problem (Charging but returns back to zero percent then back to normal)

Question

I'm kinda frustrated about my macbook pro, I seriously want this to get fixed.  My MBP  is 2  1/2 years  Last week  My mbp shut downed by itself then I figured out that the problem was the battery so I replaced it then bought a new one. I bought a replacement battery not in the apple store but I bought it online(somewhere cheap).
so now the big problem was after installing the new battery my mbp is charging but it returns back to zero percent then back to normal, so I can't pull out the charger from my computer because it will shut down.
please help me.
thanks!
My macbook pro specs:
Mid 2010
Macbook pro 13 in
Model Information:
  Serial Number:          W0********7Z2
  Manufacturer:          DP
  Device Name:          bq20z451
  Pack Lot Code:          0
  PCB Lot Code:          0
  Firmware Version:          3
  Hardware Revision:          2
  Cell Revision:          100
  Charge Information:
  Charge Remaining (mAh):          4184
  Fully Charged:          No
  Charging:          Yes
  Full Charge Capacity (mAh):          5400
  Health Information:
  Cycle Count:          2
  Condition:          Replace Now
  Battery Installed:          Yes
  Amperage (mA):          2175
  Voltage (mV):          12293
System Power Settings:
  AC Power:
  System Sleep Timer (Minutes):          10
  Disk Sleep Timer (Minutes):          10
  Display Sleep Timer (Minutes):          10
  Wake on AC Change:          No
  Wake on Clamshell Open:          Yes
  Wake on LAN:          Yes
  Current Power Source:          Yes
  Display Sleep Uses Dim:          Yes
  PrioritizeNetworkReachabilityOverSleep:          0
  Battery Power:
  System Sleep Timer (Minutes):          63
  Disk Sleep Timer (Minutes):          10
  Display Sleep Timer (Minutes):          62
  Wake on AC Change:          No
  Wake on Clamshell Open:          Yes
  Display Sleep Uses Dim:          Yes
  Reduce Brightness:          Yes
Hardware Configuration:
  UPS Installed:          No
AC Charger Information:
  Connected:          Yes
  ID:          0x0100
  Wattage (W):          60
  Revision:          0x0000
  Family:          0x0085
  Serial Number:          0x00a140cc
  Charging:          Yes
<Edited By Host>

Answer 1

Your problem is the cheap battery. No need to post a serial number. I will have a moderator remove it.