A lithium-ion battery includes a positive electrode having an active material and a polymeric separator configured to allow electrolyte and lithium ions to flow between a first side of the separator and an opposite second side of the separator. The assembly further includes an actuator that passes through the second opening that is actuated by a finger in a direction substantially perpendicular to an axis of the guidewire. The congestion limit is calculated from a comparison of the single congestion metric to a congestion target setpoint, the congestion target setpoint being a virtual dimension setpoint and the congestion limit being a manipulated variable.