The HP 609944-001 is a 200 W AC-to-DC power adapter for laptops, including the compatible HP EliteBook 8570w. Its OEM reference is 645154-001.
It accepts 100–240 V AC at 50/60 Hz and supplies 19.5 V DC at 10.3 A. The round, straight laptop plug has a center pin and measures 7.4 mm outer and 5.0 mm inner diameter, details to check against your laptop’s power connection.
A C14 inlet connects the adapter to AC power. Package contents: three-pole C13 power cable.