The 48V Smart Lithium-ion Battery incorporates a bidirectional DC/DC converter, supporting the mixed use of new and old lithium batteries, as well as the combination of lead-acid and lithium batteries. Featuring analog data acquisition, charge and discharge management, DC voltage step-up/step-down conversion, and safety protection, it provides a reliable and stable backup power supply for various energy storage scenarios, including telecom base stations, transportation, and central data centers.