Description
This is named the HP Barrel Adaptor. It’s a 4.5×3.0x0.6mm Male 5.5×2.5mm Female connector for connecting most standard 5.5mm output cables, such as that provided with the Voltaic V88, V250, and V72 battery packs, to select HP laptops.
HP Barrel Adaptor Specifications
Positive center pin.
Outer Dimension: 4.5mm
Inner Dimension: 3.0mm
Center Pin Dimension: 0.6mm
Compatibility
HP:Â HP Stream 11/13 HP Pavilion Series HP Spectre Series HP Envy Series
May also fit other laptops & electronics – check your specs!
Ryan G –
Absolutely required for a Voltaic charger to be able to charge a modern HP laptop.
Don’t let the adapter descriptions fool you. The 4.5mm adapter included will not charge modern HP laptops, and neither will the 7.4mm Dell adapter.
If you’re buying a Voltaic v88 or v250 solar battery to charge a modern HP laptop, this is absolutely necessary.
Extra advice that’s not obvious in any manual or FAQ anywhere: The regular voltaic laptop cord will not plug into this. You need to plug the “C” adapter in, then you can plug this adapter into that one. This works fine on my HP Zbook, and should work fine for Elitebooks, Probooks, Spectres, Envys, Presarios etc.