The battery is 42 watt-hours and cannot be used with any other iBooks. Apple claims it lasts up to five hours. The RGB video connector for external monitor connections is included, but the composite video cable for connecting to stereos, TVs, VCRs, and the like is not included. Yes, according to the Technical Specifications , it includes a built in microphone. Other audio input can be accomplished via USB audio.
Audio output is accomplished with the AV port.
The power receptacle is on the right hand side of the machine directly opposite the placement of all the other ports. Any G4-specific aftermarket adapter will work, such as those from MadsonLine . Yes, since there's no handle to loop a security cable through, the new iBook does in fact have a Kensington lock slot. The new 733 MHz PowerMac G4s are a 5.5 multiple of the 133 MHz bus on those machines. When you buy your stock iBook configuration, it will be with either 64 or 128 MB soldered onto the motherboard.