Laptops battery technology has changed also over the years, going from Nickel Cadmium (NiCad), to Nickel Metal Hydride (NiMH), to Lithium Ion (Li-ion).  Each type of battery has different requirements in care, but there are things you can do to extend how long your battery lasts overall.  The length of useful life from laptop batteries depends on many factors.  Overall, the amount of time you are able to run the laptop on a full charge, assuming the exact same activity is performed each time, will reduce over time to the point that the machine will die as soon as it is unplugged from the mains.  The average life span seems to be about 3 years under normal use.  Some ways of extending battery life are:

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