Other World Computing (OWC) and Newer Technology today introduced the newest edition to its NuPower high-capacity battery family with the availability of a new 55 Watt Hour rated replacement battery for the 12″ PowerBook G4. The company says this newest addition to the NewerTech NuPower Lithium-Ion battery family provides up to 17% more run-time capacity than Apple factory-shipped batteries. The new 55 Watt Hour PowerBook G4 Aluminum 12″ batteries retail for US$149.99 and come with a one-year NewerTech warranty. A 53.3 Watt Hour model is available for $139.99.