I have got a Camcorder. I have got it worked by using 2.9 volt batteries. But I could not make it able to last long. Normally it just plugs into the wall with a 12 volt and 500 mah power adapter. I have got query pertaining to this. How much d batteries do I need to make it work. I need at least two hours of back up. Or do i have to buy the camcorder battery and then solder the leads to it? I want an early response. I would really appreciate it. Thanks.