The No. 6 dry cell was one of the first batteries to replace the “wet cell” or “dangerous glass jar of liquid chemicals”, as they were called in the olden days. This site has some great info about their history (they were used to power early telephones, for example), and some different designs for repacking or remaking your own using modern D-cells.

John Edgar Park

John Edgar Park

John Edgar Park likes to make things and tell people about it. He works at Disney Research and writes for Make and Boing Boing. He is training for American Ninja Warrior. You can find him at and twitter @johnedgarpark — if you like that sort of thing.

  • gunterhausfrau

    The clips on the batteries? a friend when I was a kid (he was a retired math professor) called those “Fonstock” clips. I’ve never seen them outside of his shop. Anyone else know them by that name?

  • brumby

    When I last bought them they were called “Fahnestock” clips. I have them on a crystal set I built some time ago, but otherwise I haven’t seen them here in Australia for a long time.

  • Brian

    A quick Google found several electronic suppliers of Fahnestock clips. I remember using them on some of the kits I built while growing up.

  • gunterhausfrau

    That makes sense. I never saw the name spelled (not that spelling is my strong suit. Thanks.