SoWin Power uses recertified electric car batteries. Mostly from Nissan Leaf. These batteries go through a process after they are taken out of the electric car and are quickly ready for new use. This process allows the batteries to have a lifespan of up to 20 years, and approximately 4 to 5,000 life cycles. Each battery is 7 kWh. The maximum battery capacity in a power station today is 42 kWh.