How Do I Clear Memory On Vado Hd Pocket Camcorder

It's not that the memory isn't clearing (I suspect that when the unit is not connected to a computer, there are no files shown when you hit the "file" button), but the battery which is degrading.  Unfortunately, there appears to be a problem with the Lithium batteries, in terms of quality control and shelf life.  I got a spare with my purchase, but it wouldn't accept charge; I just bought two new ones, and the first one won't accept charge either, and I'm reluctant to even  try the other; there is no stock of batteries at the Creative website, and it's next to impossible to get through to technical support at Creative for the Vado recorders.  Perhaps that is why the product is not being offered anymore.