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Battery pack and cordless power tool using the same as power source

  • US 20030096158A1
  • Filed: 11/21/2002
  • Published: 05/22/2003
  • Est. Priority Date: 11/21/2001
  • Status: Abandoned Application
First Claim
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1. A battery pack having a positive terminal and a negative terminal, comprising:

  • a battery including a plurality of chargeable battery cells connected in series, the battery having a first terminal connected to the positive terminal and a second terminal connected to the negative terminal;

    a battery voltage detector for detecting a battery voltage across the first terminal and the second terminal of the battery;

    detection means for detecting, based on the battery voltage detected by the battery voltage detector, that the battery has reached a charge-need condition indicating that the battery needs to be charged, the detection means outputting a detection signal when the charge-need condition is detected; and

    alerting means, responsive to the detection signal, for alerting a user to charge the battery during use of the battery as a power source for a load connected between the positive terminal and the negative terminal, the alerting means giving a physically perceivable impression to the user so that the user can recognize the charge-need condition of the battery.

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