Hi all. I need to find a high capacity battery for this camcorder. I have two standard batteries that only last around 90 mins each whereas the high capacity ones have four hours plus. I have googled and e-bayed for them but to no avail.JVC have them at £90.00 but I would like a cheaper one if poss. The part numbers are BN-VF815U or BN-VF823U. There are compatible ones out there but I just would not know where to start looking. TIA.