battery calibration on Toshiba t1805-273?

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    I have a battery that's almost four years old.  I have used
it, but not all that often.  Today I was doing quite good until I got
it down to about 58%, then it went immediately to critical battery and
flatlined within about two minutes.  Is there any way I can
recalibrate so I get a better idea of when this thing is going to

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