How often should a hp laptop battery be replaced?

[liaprixbs]

I've heard that you should replace a laptop battery every two years. I've also heard that it should be replaced once it can't keep a very long charge like it used to. At what point should it be replaced? Should I choose a original  battery or replacement  battery if I want to replace my battery,such as   http://www.prixbasbatterie.com/hp-pavilion-dv6.html 

[Huffer]

There is a battery tool in the Support Assistant which will give you a readout of how many cycles the battery has had, and how much capacity is left. I would replace a battery with over 600 cycles (roughly equal to 2 years' daily use) or 60% or less of its original charge capacity. Except on an old "beater" laptop for a kid or someone who just does not have the money for a real HP battery I would not buy a "knockoff" or "generic replacement" battery. Stick with genuine HP.