I just use rubber bands, red for discharged, black for charged. Easy, quick, removable and easy to replace. I use wide ones which cover the positive terminal or both when close together.

Barb, yes the lens can be cleaned inside but not recommended for a beginner. I spoiled a lens that way when I first started cleaning my own. As to the dust inside, no lens, which zooms is completely sealed. As the lens components move in and out to focus or to change focal length a vacuum is created which pulls dust, etc into the lens. Can't be helped, nature of the beast. But a little dust will not cause a problem with you images. Make your images, check them on the computer, print the results and enjoy the image.
Rick
(Its not the hardware, its the results that are important.)