The disclosure describes devices and methods for asymmetrical irradiation at a body cavity or site, such as after removal of tissue, e. A budget of unreserved cycles of battery charging and discharging is determined, taking into account the rated battery life in terms of both time and number of cycles. In one variation, a wireless adapter also receives commands from the wireless base unit and converts the commands into a vendor-specific format used to control other devices such as a photovoltaic inverter. A method for forming thin film includes positioning a substrate in a chamber, filling a first material in the chamber, moving the substrate relative to a reaction module in the chamber, and injecting a second material to the substrate while the substrate passes the reaction module. Variable reluctance is achieved in some embodiments by varying the cross section of the target with position. From these known times and spatial locations, it is known when a mark or space must be written to ensure accurate spatial placement.