Tesla has seen rapid growth over the past several months that shows no signs of stopping. In preparation, Tesla has secured a deal with Panasonic guaranteeing much need car batteries for the next four years.

Tesla Motors, in a move which shows aggressive growth plans, inked a deal this week with Japanese giant Panasonic to expand the latter’s supply of automotive-grade lithium-ion battery cells to the electric vehicle manufacturer. This expansion targets nearly 2 billion cells over the course of four years.