Amilos are relatively easy to open, and battery should be easily detected. There's only one coin type battery in there. I don't know the v2000 model but it should not be too difficult. (HP laptops are horror). Be careful to note which screw goes where if you have to do loosen a lot of screws and parts.
They usually look something like this

or like this

There's usually some kind of part number, letters or words that help identify on the battery or on the motherboard.