17S LITHIUM BATTERY MANAGEMENT SYSTEM: JK-BD4A17S4P supports 7S-17S lithium battery packs with 0.4A energy-transfer active balancing to help maintain cell consistency DESIGNED FOR MULTIPLE LITHIUM CHEMISTRIES: Compatible with 7S-17S Li-ion/NMC, 8S-17S LiFePO4 and 14S-17S LTO battery systems. Select the correct chemistry before installation BLUETOOTH APP BATTERY MONITORING: Connect with JK BMS APP to view battery status, monitor operating conditions and adjust supported BMS parameters conveniently CONFIGURABLE BATTERY PROTECTION: Provides charge overvoltage, discharge undervoltage, overcurrent, temperature and short-circuit protection for compatible lithium battery packs FLEXIBLE APPLICATIONS FOR CUSTOM BATTERY BUILDS: Suitable for compatible lithium battery systems used in solar storage, RV, marine, mobility devices and DIY battery applications The JKBMS JK-BD4A17S4P is a lithium battery management system designed for 7S-17S lithium battery packs. It combines active balancing, Bluetooth monitoring and configurable protection functions to help maintain stable battery operation. The 0.4A energy-transfer active balancing technology transfers energy between cells with different voltage levels, helping reduce cell voltage differences and improve battery pack consistency. The JK-BD4A17S4P supports multiple battery chemistries, including Li-ion/NMC, LiFePO4 and LTO within the applicable series range. Users should select the correct battery type and cell count according to their battery pack design. Through Bluetooth connection and JK BMS APP, users can monitor battery status and configure supported parameters. Protection functions include charge overvoltage protection, discharge undervoltage protection, overcurrent protection, temperature protection and short-circuit protection. This BMS is suitable for compatible lithium battery packs used in solar applications, RV systems, marine projects, mobility equipment and custom battery builds requiring reliable cell management.