Newer Technology today announced the availability of its new 55.5 watt-hour (wh) NuPower replacement battery for iBook G3 and G4 12″/12.1″ models which provides up to 51% more capacity vs. original stock battery, notes the announcement. The NewerTech NuPower iBook 12″/12.1″ 55.5wh replacement battery has a retail price of US$129.99. Also available is the 45.5wh value model that offers up to 31% more capacity than Apple factory power units for $99.95.