Methods of charging battery packs for cordless power tool systems
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United States of America Patent
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Feb 2, 2010
Grant Date -
May 10, 2007
app pub date -
Oct 27, 2006
filing date -
Oct 31, 2005
priority date (Note) -
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Abstract
In a method of charging a battery pack, the pack is inserted in a charger and an initial set of checks of cell voltage and pack temperature is performed. Once the initial set of checks is satisfied, the cells may be charged at a first constant current level. The first constant current level is adjusted to one or more lower levels of constant current until cell voltages of all the cells are within a full charge voltage window. The voltage window is defined between a minimum full charge cell voltage level and a maximum full charge cell voltage level. The charge may be terminated once all of the cells are within the full charge voltage window.
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