How to calibrate the battery?
Most laptop batteries are ‘smart’; meaning that they know how much energy is left.Such a feature has definite benefits but the readings are often inaccurate. A laptop may indicate 30 minutes of remaining runtime when suddenly the screen goes dark.Here is the reason why: With use and time, a tracking error occurs between the chemical battery and the digital sensing circuit. The most ideal use of the ‘smart’ battery, as far as fuel-gauge accuracy is concerned, is a full charge followed by a full discharge at a constant current. In such a case, the tracking error would be less than 1% per cycle. In real life, however, a battery may be discharged for only a few minutes and the load may vary widely. Long storage also contributes to errors because the circuit cannot accurately compensate for self-discharge. Eventually, the true capacity of the battery no longer synchronizes with the fuel gauge and a deliberate full charge and discharge is needed to ‘re-learn’ or calibrate the battery. What h
