Other World Computing (OWC) and NewerTech today announced the availability of NuPower high-capacity replacement batteries for all Apple iBook G3 12-inch 500-900MHz “Dual USB” models and all iBook G3 300-466MHz “Clamshell” models. The 3600mAh “Dual USB” battery is priced at US$119.99 and provides 9 percent more capacity than the original Apple stock battery, while the 4800mAh model for $139.99 provides 45 percent more capacity. The “Clamshell” 4400mAh battery is available for $129.99 and allows for 37.5 percent more capacity, with the $139.99 4800mAh model boasting 50 percent more capacity.