Hp Laptop Charger Pinout

Note that although it may seem that the additional pin is also an electrical connector, disassembly of hp laptops with a powered usb port has shown that not to be the case. A more recent development is throttling cpu speed when the (ac) adapter can not be identified. Lind electronics manufactures laptop car chargers for panasonic toughbook, hp, dell and ibm laptops.
hp laptop charger pinout