Geekbench Air 2011 slow on battery?

I have sold my 2010 Macbook Air 11-in and just bought a custom 11-in 2011 Macbook Air (1.8Ghz, 128GB SSD, 4GB RAM). I tried running GeekBench 64-Bit on my machine and got similar results as my sister's late 2010 Macbook Pro 15-in (2.67GHz, 4GB RAM).
However my Geekbench score is only 1/3rd when on battery power whereas my sister's Macbook Pro score is unaffected while on battery.
Does this mean that there is only limited CPU power for the 2011 Macbook air while on battery?

Here are the XBench Test Results for:
* CPU
* Memory
* Disk
* Open GL
You can see that with the exception of the disk tests, everything else was 1/3rd slower on battery vs AC power.
AC POWERED RESULTS:
Results          264.05
          System Info
                    Xbench Version                    1.3
                    System Version                    10.7 (11A2063)
                    Physical RAM                    4096 MB
                    Model                    MacBookAir4,1
                    Drive Type                    APPLE SSD SM128C
          CPU Test          218.99
                    GCD Loop          291.99          15.39 Mops/sec
                    Floating Point Basic          189.12          4.49 Gflop/sec
                    vecLib FFT          137.46          4.53 Gflop/sec
                    Floating Point Library          438.93          76.43 Mops/sec
          Memory Test          565.53
                    System          613.96
                              Allocate          2044.09          7.51 Malloc/sec
                              Fill          377.37          18348.46 MB/sec
                              Copy          572.37          11822.06 MB/sec
                    Stream          524.18
                              Copy          512.52          10585.83 MB/sec
                              Scale          506.52          10464.50 MB/sec
                              Add          547.73          11667.72 MB/sec
                              Triad          531.97          11380.17 MB/sec
          Quartz Graphics Test          345.08
                    Line          332.33          22.13 Klines/sec [50% alpha]
                    Rectangle          429.05          128.09 Krects/sec [50% alpha]
                    Circle          329.21          26.83 Kcircles/sec [50% alpha]
                    Bezier          294.88          7.44 Kbeziers/sec [50% alpha]
                    Text          367.55          22.99 Kchars/sec
          OpenGL Graphics Test          144.70
                    Spinning Squares          144.70          183.56 frames/sec
          Disk Test          358.14
                    Sequential          225.81
                              Uncached Write          435.10          267.15 MB/sec [4K blocks]
                              Uncached Write          323.32          182.94 MB/sec [256K blocks]
                              Uncached Read          100.98          29.55 MB/sec [4K blocks]
                              Uncached Read          413.11          207.63 MB/sec [256K blocks]
                    Random          865.25
                              Uncached Write          775.31          82.08 MB/sec [4K blocks]
                              Uncached Write          601.23          192.48 MB/sec [256K blocks]
                              Uncached Read          1824.65          12.93 MB/sec [4K blocks]
                              Uncached Read          891.39          165.40 MB/sec [256K blocks]
BATTERY POWERED RESULTS:
Results          81.95
          System Info
                    Xbench Version                    1.3
                    System Version                    10.7 (11A2063)
                    Physical RAM                    4096 MB
                    Model                    MacBookAir4,1
                    Drive Type                    APPLE SSD SM128C
          CPU Test          50.37
                    GCD Loop          81.44          4.29 Mops/sec
                    Floating Point Basic          39.58          940.36 Mflop/sec
                    vecLib FFT          28.93          954.43 Mflop/sec
                    Floating Point Library          136.93          23.84 Mops/sec
          Memory Test          202.44
                    System          190.30
                              Allocate          577.88          2.12 Malloc/sec
                              Fill          123.19          5989.74 MB/sec
                              Copy          169.03          3491.17 MB/sec
                    Stream          216.22
                              Copy          214.08          4421.75 MB/sec
                              Scale          207.74          4291.95 MB/sec
                              Add          230.70          4914.48 MB/sec
                              Triad          213.67          4570.93 MB/sec
          Quartz Graphics Test          108.28
                    Line          106.93          7.12 Klines/sec [50% alpha]
                    Rectangle          126.13          37.66 Krects/sec [50% alpha]
                    Circle          97.73          7.97 Kcircles/sec [50% alpha]
                    Bezier          98.28          2.48 Kbeziers/sec [50% alpha]
                    Text          117.79          7.37 Kchars/sec
          OpenGL Graphics Test          41.51
                    Spinning Squares          41.51          52.66 frames/sec
          Disk Test          345.46
                    Sequential          220.05
                              Uncached Write          403.11          247.50 MB/sec [4K blocks]
                              Uncached Write          308.79          174.71 MB/sec [256K blocks]
                              Uncached Read          100.83          29.51 MB/sec [4K blocks]
                              Uncached Read          393.55          197.80 MB/sec [256K blocks]
                    Random          803.21

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