Abstract: A battery includes a can having a rectangular or triangular cross section, the can having a closed end and an open end, a cathode in the can, an anode in the can, a separator between the cathode and the anode, and a seal assembly attached to the open end of the can.

Abstract: A battery cartridge includes a casing, a battery in the casing, and a slide moveably engaged with the casing. The battery has an opening, and the slide has an opening alignable with the opening of the battery.

Abstract: Apparatus couples optical fiber to an optoelectronic component with a collet, a cylindrical member, a connector, and hermetically sealing means. The collet has a central orifice through a knurled end portion, a central portion with a male thread, and a second end portion formed with a slotted cone sleeve. The cylindrical member has opposed centrosymmetric recesses that meet, forming a small axially oriented aperture. One recess is formed with an axial female thread, with a conical indentation terminating at the aperture. The female thread can to engage with the collet male thread. Thread engagement of member and collet results in engagement of the member at the conical indentation with the coned sleeve, drawing the slotted sides inwardly, firmly gripping the collet held optical fiber. The other recess has a second axial female thread from the opposite end of the member toward the aperture. The member has a radially directed sight hole.