A bipolar battery and a battery assembly unit that reduces a current density change in a battery element is disclosed. The environment indicators are transmitted in the transmittable data format to a universally accessible server system in association with a particular universal identifier for a particular user. Further, in the substrate cleaning method, a high-energy light may be irradiated on the backside of the substrate. Each of the exercise devices also comprises a plurality of strips which are attached to the surface of the cavity. According to one embodiment, the window frame is placed within a mold such that the inner portion of the window frame projects into an inner cavity inside the mold.