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Apparatus and methods for determining appropriate timing for recharging rechargeable batteries

  • US 6,577,104 B2
  • Filed: 04/15/2002
  • Issued: 06/10/2003
  • Est. Priority Date: 04/17/2001
  • Status: Expired due to Term
First Claim
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1. An apparatus comprising:

  • a voltage detector arranged and constructed to detect the voltage level of at least one rechargeable battery, and a controller arranged and constructed to (a) select a reference voltage level from a plurality of reference voltage levels stored in memory based upon use history of the rechargeable batteries stored in memory, (b) compare the detected battery voltage level to the selected reference voltage level, and (c) indicate that the at least one rechargeable battery is due for recharging when the detected battery voltage level becomes equal to or less than the selected reference voltage level.

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