Tesla is recalling around 10,500 units of its Powerwall 2, a backup battery for residential use, according to a U.S. Consumer Product Safety Commission disclosure out Thursday. "The lithium-ion battery cells in certain Powerwall 2 systems can cause the unit to stop functioning during normal use, which can result in overheating and, in some cases, smoke or flame and can cause death or serious injury due to fire and burn hazards," the CPSC recall notice said. While Elon Musk 's electric vehicle