END CAP FOR BATTERY OR CYLINDRICAL RECHARGEABLE CELL

Devices for insulating the electrical terminals of cylindrical batteries, such as lithium-ion cells, to prevent the occurrence of shorting. Certain embodiments are directed to devices which cover one or more terminals of the cell, thereby providing an insulative barrier, while still allowing the cell to be used. Various embodiments are described including partially covering the topmost portions of the negatively charged exterior cell case, closest to the positive terminal of the cell, and attaching the covering via a circumferential appendage which locks onto the cell. In another embodiment the cell covering extends axially down the side of the cell case to cover part of, or the entirety of, the side of the negatively charged case.