4. High-speed and efficient charging method 1. High-end technology MPPT solar maximum power tracking charging management chip, with trickle, constant current, constant voltage charging management 2. high-frequency low-conductivity internal resistance dual MOS tubes, high-current diodes, high-efficiency flat high-power inductors, alloy current detection resistors 3. The large-size aluminum heat sink at the bottom ensures long-term stable operation under high current 5. Dual status indicator lights, the red light flashes when the battery is not connected, the green light is always on, the red light is on when charging, it stops when it is fully , and the green light is on at the same time, Weight: 0.02866009406 Pounds, Manufacturer: Yoeruers