I saw this funky piece this morning on Dinosaurs and Robots.
It was made by artist Michel de Broin whose website explains:
Dead Star is made from residual battery at the end of their duty. Left to itself, the sculpture will slowly cool down since there is no longer electronic activity taking place in it. The hundreds of batteries were once used to power appliances before they finish their cycle in a recycle facility. Retrieved from death, they were assembled again in this whole structure.