When the battery is being charged, it will compare the total amount of charge it received with the number (indicating the max. charge) stored inside the battery to determine the percentage of charge it is holding (gauge). It will also transfer the information via SMBus to the notebook, so that the information can be shown on the LCD window. After certain uses (or simply aging), the total charge battery can hold will reduce, but the battery doesn’t know it until the max. charge number stored inside the battery is reset. To automatically reset the max. charge number in the battery, you can run battery learning software (downloadable from the manufacturer’s website). After the learning cycle, battery will function just like a new one. It will also correct the problem such as: after totally discharging the battery, notebook will not charge it unless using Radio Shack charger to charge it first.
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