Battery charger and method to recall last charge state
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United States of America Patent
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Sep 24, 2002
Grant Date -
N/A
app pub date -
Jul 18, 2001
filing date -
Jul 18, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
This invention includes a method that allows a charger to quickly identify a battery pack. Once the battery pack has been identified, the invention allows the charger to determine whether prior charging processes should be resumed, or whether the charging cycle should be started anew. In one preferred embodiment, the battery includes a memory device having a unique identifier like a serial number, for instance. When the battery is coupled to the charger, the charger identifies the battery and queries the charger memory. If the battery has been disconnected from the charger for more than a predetermined amount of time, the charger presumes the battery has been depleted and starts the charging cycle from the beginning. If the battery has been disconnected for a short period of time, the charger presumes that the battery has not been greatly depleted and begins the previous charging process that was running when the battery was disconnected from the charger.
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