MBP 13 Retina shuts down at 8% without warning

Hi
I have a MacBook Pro Retina 13'', Late 2012, with OS X 10.9.2 (13C64). It keeps shutting down at 8% on battery power. On charge, it is ok. I don't get any low battery warning before shutting down. Obiously I lose everything every time. I have reset the SMC, Pram/nvram. I have also run Apple Hardware Test, and checked the battery status:
Battery Information:
  Model Information:
  Serial Number:          C013302007VF957AM
  Manufacturer:          DP
  Device Name:          bq20z451
  Pack Lot Code:          0
  PCB Lot Code:          0
  Firmware Version:          511
  Hardware Revision:          000a
  Cell Revision:          1155
  Charge Information:
  Charge Remaining (mAh):          4843
  Fully Charged:          No
  Charging:          Yes
  Full Charge Capacity (mAh):          6410
  Health Information:
  Cycle Count:          154
  Condition:          Normal
  Battery Installed:          Yes
  Amperage (mA):          2667
  Voltage (mV):          12065
It was working properly before. I am not sure, but I believe, it started doing that after I had reset the SMC. I had done it (and pram/nvram) because it was a bit slow. I have also realised, the battery is loose inside. If i gently shake the machine, it rattles, when the machine is cold. If it is hot, doesnt do that.
Do I should get a low battery warning under 20% anyway? I beleive so.

Hi, thanks for your answer. I will take it to Genius Bar one day (it is 1000 km away from us), but in the meantime, I would like to investigate the "no warning at low power" issue. The battery does the same rattling nearly from the first minute. I took it to NextByte (premium reseller) where I bought it, but they are useless, their service is crap.
My main question is at the moment, why I don't get any low power warning? usually I don't let it go down under 30%, but it obviously can happen sometimes. As I am a graphic designer, it is not the best thing to lose 3-4 hours work. 

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    USB Device: Hub
    USB Device: Hub
    USB Device: BRCM20702 Hub
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    com.silex.driver.sxuptp          1.5.1
    com.citrix.driver.net6im          1.1.3
    com.deterministicnetworks.driver.dne          1.0.9
    com.deterministicnetworks.driver.dniregistry          1.0.4
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    Clinton

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    Have you done a SMC reset?
    http://support.apple.com/en-us/HT201295
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    http://support.apple.com/en-us/HT201257
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