The invention relates to a method for packet switched streaming of media, such as video andor audio, from a streaming server to a mobile client device over an air-interface. A stack structure and vertical channel structures are provided on a substrate. Voltage to ground of the other batteries is monitored to adjust current at those batteries where voltages in all of the battery cells are maintained substantially equal during charging. The first microelectronic element can be configured to regenerate at least some signals received by the microelectronic assembly at the terminals and to transmit said signals to the second microelectronic element. The electrical system is driven so as to optimize energy saving based on deviation of current user status and current environmental parameters from the temporal habit pattern.