After a long and bumpy road, battery-producer A123 Systems has officially filed for bankruptcy. This news comes immediately after word that the Waltham, Massachusetts-based company may not have ...

A123 makes a pretty good lithium battery that has a high-cycle life and can put out loads of power. What it's not so good at, however, is holding a lot of energy. At least, not when compared to ...

DeWalt’s been selling a LiIon 36 volt battery pack that’s full of the latest A123 cells. These are the same ones that were used in the Killacycle. (I think they’ve got a new batch of cells now).