Browse Prior Art Database

Dual Battery Charger for External Notebook Computer Options

IP.com Disclosure Number: IPCOM000115351D
Original Publication Date: 1995-Apr-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Nelson, FA: AUTHOR [+2]

Abstract

Disclosed is a battery charger configured to simultaneously charge an internal battery, within a portable electronic device, and an extra, external battery, which may also be used by the portable electronic device.

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This is the abbreviated version, containing approximately 70% of the total text.

Dual Battery Charger for External Notebook Computer Options

      Disclosed is a battery charger configured to simultaneously
charge an internal battery, within a portable electronic device, and
an extra, external battery, which may also be used by the portable
electronic device.

      Fig. 1 is a side elevational view of the battery charger 10, to
which the portable electronic device 12 is electrically connected by
terminals at an interface surface 14.  Device 12 includes an internal
battery 16 which is charged from circuits within charger 10 in this
way.

      Fig. 2 is an end elevational view of charger 10 and device 12.
Charger 10 includes upstanding cradle segments 15 holding device 12
in place and a central trough 18 into which a extra battery 20 is
placed for simultaneous charging with the battery 16 in device 12.
Electrical connections 22 extend between extra battery 20 and
circuits within charger 10.  Electrical power, in the form of either
alternating current from a transformer plugged into line power, or in
the form of direct current from a vehicle battery, is supplied to
charger 10 through a power line 24.  This current charges each of the
two batteries 16 and 20 at a rate inversely proportional to its level
of charge, so that the battery with the lowest level of charge is
charged the fastest.  In this way, both of the batteries 16 and 20
are brought to a full charge at about the same time.  Alternately,
either of the two batteries may be char...