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Charging system having electromagnetic field means for distinguishing between primary and secondary batteries

  • US 4,577,145 A
  • Filed: 10/11/1984
  • Issued: 03/18/1986
  • Est. Priority Date: 10/11/1984
  • Status: Expired due to Term
First Claim
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1. A battery charging system adapted to distinguish a rechargeable battery type from a non-rechargeable type, both said types being of substantially similar shape and size, said system comprising, in combination:

  • a rechargeable battery circuit having a first non-charging mode and a second charging mode, said circuit having first and second contacts arranged for engagement with the first and second external load terminals, respectively, of said rechargeable battery;

    a radiating device for radiating an electromagnetic field proximate to said battery when the battery is placed in engagement with said contacts of said charging circuit;

    said rechargeable battery including indicating means responsive to the electromagnetic field for providing an indication distinguishing said rechargeable battery from a non-rechargeable battery; and

    enabling means responsive to the indication from said indicating means and in response thereto enabling the charging mode of said charging circuit, whereby said charging circuit will be enabled for charging only batteries of the rechargeable type.

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