Patent ID: 7910239

Claim:
A rechargeable battery device comprising: an electric cell comprising a casing, a positive electrode, and a negative electrode; a top connection cap electrically connected to the positive electrode; and a bottom connection cap electrically connected to the negative electrode, wherein the top connection cap comprises a first mechanical fastener of a first kind that comprises a female member fixedly engaged with an inner surface of the top connection cap, and configured to be fastened to a removable mechanical fastener of a second kind, wherein the bottom connection cap comprises a second mechanical fastener of a second kind that comprises a male member having a head portion fixedly engaged with an inner surface of the bottom connection cap and having a threaded portion extending away from an inner surface of the bottom connection cap, and configured to be fastened to a removable mechanical fastener of the first kind, said first and second kinds of mechanical fasteners being adapted to fasten in different manners.