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A battery capacity monitoring system readily indicates the remaining capacity of an uninserted battery pack upon an operator's request. Such request may involve the touching of one or more contacts disposed on the battery pack. The battery pack also includes a display and a communication means for c

A battery capacity monitoring system readily indicates the remaining capacity of an uninserted battery pack upon an operator's request. Such request may involve the touching of one or more contacts disposed on the battery pack. The battery pack also includes a display and a communication means for communicating capacity information to the device in which it may be installed. The communication means may also be used to display status when the battery pack is not inserted. When inserted a device, the battery pack and device participate to determine time estimates for remaining battery life based on known device loading characteristics and current battery capacity. An operator viewing such information may more adequately determine the usage value of the current battery charge. Moreover, the battery pack and corresponding device are configured to detect the beginning of the process of removing a battery pack. In response, the device saves operational states and data before losing power. Such stored information may be restored upon insertion of another battery pack into the device, permitting the operator to continue where they left off.

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A battery capacity monitoring system readily indicates the remaining capacity of an uninserted battery pack upon an operator's request. Such request may involve the touching of one or more contacts disposed on the battery pack. The battery pack also includes a display and a communication means for c

A battery capacity monitoring system readily indicates the remaining capacity of an uninserted battery pack upon an operator's request. Such request may involve the touching of one or more contacts disposed on the battery pack. The battery pack also includes a display and a communication means for communicating capacity information to the device in which it may be installed. The communication means may also be used to display status when the battery pack is not inserted. When inserted a device, the battery pack and device participate to determine time estimates for remaining battery life based on known device loading characteristics and current battery capacity. An operator viewing such information may more adequately determine the usage value of the current battery charge. Moreover, the battery pack and corresponding device are configured to detect the beginning of the process of removing a battery pack. In response, the device saves operational states and data before losing power. Such stored information may be restored upon insertion of another battery pack into the device, permitting the operator to continue where they left off. ncy that sweeps across one of the continuous frequency ranges as a function of time in one of the at least two bands, the generator further drives the transducer array to sweep amongst the frequency ranges, so as to generate intense sound energy characterized by a frequency that sweeps across at least one additional frequency range as a function of time in at least one additional band of the at least two frequency bands, such that the transducer array couples sound energy to the liquid with a combined bandwidth that is greater than each of the at least two frequency bands. 94. A system for coupling sound energy to a liquid, comprising: at least two transducers forming a transducer array adapted for coupling to a liquid in a tank, the transducer array constructed and arranged so as to be capable of producing intense sound energy in the liquid at any frequency within at least two overlapping frequency bands; and, a signal generator adapted for producing a driver signal for driving the transducer array at any frequency from one or more continuous frequency ranges within each of the at least two frequency bands; wherein the driver signal of the signal generator drives the transducer array so as to produce intense sound energy characterized by a plurality of changing frequencies within a first frequency range, followed by a plurality of changing freque