Chunlan DYL12.8-100-A11 power supply system products, including lithium-ion battery pack, battery management system, used in agricultural plant protection, power grid maintenance, field mapping, fire rescue, outdoor operations and other fields. Chunlan lithium-ion battery is a high-power, pollution-free, maintenance-free green battery, with high specific power, long life, small internal resistance, large current charge and discharge, high efficiency, no memory effect and other excellent characteristics. The battery management system is developed according to the requirements of the battery use scene, which can monitor， manage and protect the lithium ion battery pack in real time during the use of the battery pack.