Traditional lead-acid batteries have shortcomings of limited cycle life and poor fast charging performance. The upgraded lead-carbon batteries greatly adapt to wind-solar standby energy storage scenarios. By adding carbon materials to the traditional lead-acid system, they improve charging acceptance and cycle life, adapting to unstable charging modes of wind-solar power generation with resistance to frequent charge-discharge and sulfation failure. As standby power sources, they have low failure rates and long service life, reducing replacement and operation costs of wind-solar energy storage systems. Combining low cost and high performance, lead-carbon batteries are widely used in wind-solar energy storage power stations as a long-term cost-effective and stable standby solution.