Alignment methods of IC device substrates. A dark signal is read out of one or more dark reference pixels in each column and used to determine a column offset for one or more columns in the pixel array. Each option pad of the plurality of option pads is connected to a corresponding option lead of the plurality of option leads. The novel battery pack has built-in safeguards against dangerous LiPo battery conditions and is implemented in a small, portable unit which contains the battery cells, control and protection circuitry, internal charger and display gauge. The first back portion is rotatably attached to the second base portion.