12V 20A DC-DC Battery Charger for RV, Van, Boat, Off-Grid | Lithium & Lead-Acid Batteries

Features Broad System Compatibility Compatible with 12V AGM, Flooded, Gel, and Lithium batteries Compatible with smart or traditional alternators via connection to the 12V starter battery Ideal for RVs, vans, boats, and off-grid power systems Smart Multi-Stage Charging 2-stage charging for lithium batteries 3-stage charging for lead-acid batteries (Bulk → Absorption → Float) Lithium Battery Activation: Automatically wakes up over-discharged lithium batteries Smart Protection & Control Built-in protection against over-voltage, over-temperature, and reverse polarity Battery isolation prevents reverse current between batteries and protects the starter battery Advanced Control Interfaces D+ Ignition Terminal: Charges only when the engine is running to protect the starter battery LC Terminal: Activates low current mode (10A) for small alternators or weak power sources RJ11 Temperature Sensor Port: Adjusts voltage for cold and hot environments to protect battery lifespan (Not for lithium batteries) *D+, LC cables, and a temperature sensor are not included Specifications Output Nominal Power: 250W  Output Nominal Current: 20A Operating Current Range: 18~22A Low Current Mode: 10A Floating Charge Current: 3~5A Low Current Mode Current Range: 8~11A Quiescent Current: ＜0.45A Ripple Voltage: ＜500mV rms Battery Charging Mode: 3-Stage type Efficiency: >85%, @14VDC 30% load Input Nominal Voltage: 12VDC Operating Voltage Range: 10~16VDC Input Current Limit: ≤34A Dimensions: 8.4*7.4*3.1 in / 213*188*79 mm Weight: 4.0lb / 1.8kg