I bought this as a spare for my work laptop, now I have a different laptop this is surplus to requirements, I only used this on 3-4 ocassions from new. It is a genuine HP charger not a cheap generic version.
HP 384020-001 384021-001 ADAPTOR CHARGER SUPPLY
Output 19V 4.74A, 90watts
Should be compatible with a wider range of laptops, should be easy to google.