Field private network communication devices in power, water conservancy and traffic scenarios are widely distributed with poor power conditions and rely heavily on energy storage batteries. Lead-acid batteries feature strong environmental adaptability and operate stably in high and low temperature, humid and sandy outdoor environments, ideal for field communication towers, monitoring terminals and border communication stations. In off-grid or power-off scenarios, they support long-term continuous power supply to ensure uninterrupted private network data transmission, voice communication and status monitoring. With high safety, no thermal runaway risk, convenient maintenance and low replacement cost, they are the most reliable and cost-effective backup power solution for outdoor private network communication.