Abstract: A cellular telephone utilises a plurality of batteries with each battery having an associated charging circuit. Power is applied to the charging circuit from a charging device which device may be a mechanical rotating member. A control module is associated with each one of the charging circuits and selects the battery or cells of the battery to which the power is to be provided. If one battery or cell is being discharged, the charge is applied to the other non-used battery or cell. If one battery or cell is discharged and the phone is not being used, the power is applied to the lowest voltage battery or cell.

Abstract: A muffler assembly has a housing and an internal and replaceable core assembly. The core assembly may contain emission reduction elements to reduce the emissions from the engine and/or sound reducing elements. The core assembly is replaced within the housing when the emission reduction elements become ineffective or when the user desired to otherwise replace the internal core assembly without replacing the muffler housing or assembly components. The core assembly may take the form of a sealed cartridge to isolate exhaust treatment apparatuses from the ambient environment.