Renogy 12V 40A DC to On-Board Battery Charger for Flooded, Gel, AGM, and Lithium Batteries, Using Multi-stage Charging in RVs, Commercial Vehicles, Boats, Yachts

【Compatible Multiple Battery Types】 Compatible with a multitude of alternator types, the DC-DC battery charger offers correct charging for AGM, Flooded, Gel, and Lithium batteries. 【Smart 3-stage Charging】 The DC-DC battery charger will charge your house batteries from the starter battery by 3-stage charging (Bulk, Boost, and Float), to make sure it optimally and automatically charge to 100%. 【Various Protections For Ultra Safety】 Offers Over-voltage Protection, Over-temperature Protection, and Reverse Polarity Protection to ensure operation safety. It also isolates the input and output to prevent voltage transmission errors and interfere with house battery charging. 【Protect Your Starter Battery】The DC-DC battery charger is capable of identifying whether the generator is started, to prevent over-discharge of the starting battery and protect the generator. 【Reliable Quality】The compact and robust design makes it suitable for all conditions. CE certification.