A mobile power assembly includes a battery coupled to a circuit, a signal receiving unit located at a side of the battery and coupled to the circuit, and a signal sending unit located at an opposite side of the battery and coupled to the circuit. In an embodiment, a method for backhaul transport recovery is provided. The air flow rate dropping below a threshold, such as a certain percentage of an initial or baseline flow rate, indicates that sufficient cells have been collected to provide sufficient filter coverage. The method debits an account of a player that transferred the currency and credits an account of a player that that received the currency.