A system and method for seamlessly reprogramming clock frequencies includes a phase locked loop that generates CPU and double data rate clocks. An embodiment is comprised of a plurality of Lithium-ion pouch type unit cells stacked in a linear array. The holder, which is pivotally assembled to the base, has a trench formed on a sidewall thereof and encircling the holder. The polysilicon layer inside the trenches gets fully oxidized resulting in void-free trench isolation.