The batteries are available in that, according to the company, can extend the iPad's internal battery by roughly two to nine times, providing for a total run-time of between 34 and 99 hours depending on the battery model.

HyperMac's military grade lithium ion cells are rechargeable up to 1000 times and come with a one-year warranty. The 60Wh battery cost $169, the 100Wh battery $269, the 150Wh battery $369, and the 222Wh battery $469 (add $31 to those prices if you want the cables necessary to power MacBook models as well). The batteries are available now for pre-order, and should begin shipping in two weeks.