I don't understand the issue about deleting images from a card. I have run many thousands of images through Downloader Pro, using a Dazzle card reader. Once I finish downloading and have verified the download, Dl Pro lets me delete the successfully downloaded images easily, without having to waste camera batteruy power. I have used a variety of different CF cards (mostly SanDisk) and never had a problem.
Why is running down the camera battery safer?