EnergyCS is a Monrovia, California-based company specializing in integration and controls for high-energy, large format batteries. The company provides battery management systems for lithium-ion batteries and other advance energy storage technologies and is active in the electric vehicle and stationary energy storage space. EnergyCS is also a pioneer in the area of PHEV (Plug-in hybrid Electric Vehicles). The company produced the first lithium-ion powered plug-in Prius. External links EnergyCS website solar power energies Grid energy storage Manufacturing companies based in California Technology companies based in Greater Los Angeles Companies based in Los Angeles County, California Monrovia, California Electronics companies established in 2001 Manufacturing companies established in 2001 Renewable resource companies established in 2001 American companies established in 2001 2001 establishments in California