Disclosed are methods and apparatus for providing redundant data forwarding or routing capabilities. The lithium secondary battery includes an electrode assembly having a first electrode plate, a second electrode plate and a separator, a can for receiving the electrode assembly and an electrolyte, and a cap assembly having a cap plate, an insulating plate, a terminal plate and an electrode terminal and being assembled with an upper opening of the can in order to seal the can. The device further includes a drawstring that is threaded through a proximal end of the anchor, and barbs that extend from the exterior surface of the anchor. In addition, the second level integration solver is implemented by a hardware processor and is configured to perform a continuous second level integration based on a second probability distribution function modeling variations between dies to determine the chip yield.