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A safety device for a portable battery-powered electric apparatus having a battery unit with one or more battery cells for supplying power to electric circuitry in the apparatus. The apparatus is connectable to a charging device for charging the battery unit while maintaining the supply of power to

A safety device for a portable battery-powered electric apparatus having a battery unit with one or more battery cells for supplying power to electric circuitry in the apparatus. The apparatus is connectable to a charging device for charging the battery unit while maintaining the supply of power to the apparatus. The safety device has a first fuse device connected between the battery unit and a first terminal of the apparatus for receiving charging current from the charging device, and a second fuse device connected between the battery unit and a second terminal of the apparatus for supplying power to electric circuitry in the apparatus. The fuse devices are operatively independent of each other, particularly in that the second fuse device maintains the electric connection between the battery unit and the electric circuitry in the apparatus, even when or if the first fuse device releases or opens in response to an undesired condition in the charging device.

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[ What is claimed is:] [1.] A safety device for a portable battery-powered electric apparatus having a battery unit with at least one battery cell for supplying power to electric circuitry in the apparatus, the electric apparatus being arranged to be connected to a charging device for charging the b

[ What is claimed is:] [1.] A safety device for a portable battery-powered electric apparatus having a battery unit with at least one battery cell for supplying power to electric circuitry in the apparatus, the electric apparatus being arranged to be connected to a charging device for charging the battery unit while maintaining the supply of power to the electric apparatus, comprising:a first fuse arranged to be connected between the battery unit and a first terminal of the electric apparatus for receiving charging current from the charging device, anda second fuse arranged to be connected between the battery unit and a second terminal of the electric apparatus for supplying power to electric circuitry in the electric apparatus,wherein the first and second fuses are operatively independent of each other, particularly in that the second fuse can maintain an electric connection between the battery unit and the electric circuitry in the apparatus even if the first fuse opens in response to an undesired condition in the charging device.