Compatible with AGM, Flooded, Gel, and Lithium batteries. 3-stage charging ensures a 100% full battery charge. Numerous safety protections. Smart 3-stage charging: bulk, boost, and float. Protects your starter battery. Renogy DC-DC Battery Chargers provide an excellent solution for direct house battery charging from a starter battery. With these chargers being compatible with most alternator types, one gets accurate charging abilities for AGM, Flooded, Gel, and Lithium deep-cycle batteries. The 3-stage charging system and advanced electronic protections guarantee both safe and optimal battery performance. It also features input-output isolation, which provides added safety by eliminating voltage transmission errors. Strong, compact, and durable, these DC-DC chargers are the perfect fit for RVs, commercial vehicles, boats, and yachts, offering reliable power wherever your adventures take you! Empower Your Journey on the Go Maximize charging efficiency on the go with enhanced versatility. Universal Compatibility Comprehensive Protections Compatible with Multiple Battery Types The DC-DC battery charger is compatible with various alternator types, providing optimal charging for AGM, Flooded, Gel, and Lithium batteries. Seamless Charging, Ultimate Safety Isolated input/output with multifunctional safety technology for error-free and secure house battery charging. Protect Your Starter Battery Renogy's DC-DC battery charger works seamlessly with traditional and smart alternators. The included D+ Ignition cable identifies generator starts, safeguarding the starting battery from over-discharge and protecting the generator. (Recommended: 18-16AWG copper cable. D+ Ignition Cable not included.) Smart Charging Protection The DC-DC battery charger's LC wire automatically adjusts the charging current, safeguarding the house battery from potential damage due to excessive charging. (Recommended: 18-16AWG copper cable. LC cable not included.) Smart 3-Stage Charging The DC-DC battery charger uses a 3-stage charging process (Bulk, Boost, and Float) to efficiently and automatically charge your house batteries from the starter battery, ensuring they reach 100% capacity. Prolong Battery Lifespan Automatically adapts charging modes to match battery voltages, while the temperature sensor provides -3mV/°C/2V compensation, ensuring optimal charging in varying temperatures. (Please note that the temperature sensor is not included. If the lithium battery has a built-in BMS, an external temperature sensor is unnecessary.) Explore the Complete Connection The Renogy Difference Explore the Complete Connection Going solar is not that complicated. Renogy is here to help you build your system faster so you can roam further. The Renogy Difference Going solar is not that complicated. Renogy is here to help you build your system faster so you can roam further. Connect with Renogy customers. Go to Power Plus Community Still have questions? Ask our specialist Renogy 20A DC to DC...