Yes... Get a Targus or Kensington laptop universal PS. I use a Targus for my laptop in the Office and keep the OEM one in my backpack for field work. This is my second laptop with the same PS. tThey come with multiple heads to match the power socket on your device.
Check with the HP support sight for the voltage and watts needed for thedv9700 and get oine that is at LEAST what the factory one is. Personally, mine is a 95watt and my factory one is only 65 watts. No Problems, ever.