SmartLi is a battery energy storage system developed by Huawei for UPS, which has the features of safety and reliability, long lifespan, space saving and easy maintenance. LFP is the safest cell of Li-ion battery. The unique active current balance control technology supports the mix use of new and old batteries, which reduces Capex (Capital Expenditure). Three-level BMS system realizes intelligent battery management with Huawei UPS and Network management system, which reduces Opex (Operating Expense).