Supports 1-4 battery configurations. Features comprehensive protection including overcharge/over-discharge/short-circuit/over-temperature safeguards. Enables balanced charging for optimal battery performance. Multi-mode charging options:18-24V Solar MPPT charging,USB PD3.0 fast charging, 18-24V external DC charging. Web-based configuration for charging/discharging parameters. LED battery level indication. One-touch output shutdown function. Dual-mode wireless communication: Bluetooth connectivity, LoRa long-range communication (up to 10km range). Expansion interfaces for displays, GPS, and general-purpose I/O. Excellent low-power performance. Typical Applications: Environmental Monitoring Systems. Smart Agriculture & Livestock Farming. Asset Management and Tracking. Outdoor Emergency Solutions. Solar Street Lighting Systems. Industrial Infrastructure Monitoring. Open-source projects like for "Meshtastic" General Specifications: chip: BQ4050, CN3795 Main Control Module: HT-n5262M(nRF52840+SX1262) PCB Storage Condition:-30-80, 90%RH(No condensing) Input Voltage:18-24V Battery charging current:less than equal 1.5A Balancing:4.2V, 100mA Overcharge Protection:4.3V Overcurrent Protection:2A Undervoltage Protection:2.5V Solar & Pack Interface:XT30 Female Battery Cell Interface:PH2.0-8P Interface:MX1.25-8P MCU Control Board Interface:PCIe M.2 Dimensions:43x97x11mm MCU Current:500mA Max Number of Managed Battery Cells:1-4 cells USB Expansion Interface:USB Type C Expansion Interface: Screen: MX1.25-9P, GNSS: MX1.25-8P Specifications:Li-Ion Color:As Shown Material:PCB Package Contents: 1 * Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.