AC/DC Medical-Grade 135 W Power Adapters charge HP laptops.

Approved to medical standards and rated 135 W/19 V, 6.73 x 2.83 x 1.65 in. TMP135-19-HP features 5.1 x 7.4 x 12 mm barrel connector with

[source: http://news.thomasnet.com/fullstory/AC-DC-Medical-Grade-135-W-Power-Adapters-charge-HP-laptops-20038302]