Outboard battery for Powerbook

I remember seeing somewhere an article on an outboard battery for laptops, that was very thin and had about the footprint of a laptop.

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Joe Kotroczo wrote on 3 September 2003:

Hello,

I remember seeing somewhere an article on an outboard battery for laptops, that was very thin and had about the footprint of a laptop. Does such a thing exist with a plug for G4 Powerbooks, and if yes, who makes it or where can I get one?

Thanks.

Joe