Battery life and mAh
Battery life refers to the time your notebook, tablet or Ultrabook™ can run before it needs to be recharged. This can be expressed as miliampere hour (mAh). The larger the number, the longer your device can run.
MB, GB and TB
These terms are used to describe disk or storage space, standing for a megabyte (MB), a gigabyte (GB) and a terabyte (TB) respectively. A GB is 1,000 MBs and 1 TB is 1,000 GBs. To get a sense of scale, an HD movie requires at least 2 GBs and a high quality photo, about 4-5 MB.