【Manually select lead-acid or lithium battery mode】Unlike auto battery identification functions that are prone to failure and misrecognition, manual switching between lithium and lead-acid battery modes delivers far more stable performance. It effectively prevents damage to your expensive batteries caused by system recognition errors. Simply slide the switch, and mode switching is done in just 1 second. 【WF-8955PEC POWER CONVERTER】:The WF-8955-MBA is for mounting to the WF-8955PEC power converter. Compatible with RV's WF-8955-AD-MBA and WF-8955-MBA. for 12V RV Lead-Acid batteries. Free warranty against manufacturer defects (3 years) 【Quiet Fan】: The fan automatically adjusts the air speed according to the battery temperature to ensure it runs when needed. The silent fan is designed so that you will not be disturbed even when you are sleeping. 【HIGH QUALITY CONVERTER】: SUPLIFE utilizes higher quality materials and stricter technical standards to ensure that the output voltage and charging profile are the same as your original OEM converter. Using a converter with the same technology gives you a better experience and increases battery life. SUPLIFE relies on more than a decade of power manufacturing expertise and the endorsement of millions of satisfied customers. We confidently back your product with a comprehensive three-year manufacturer's warranty and lifetime technical support. Your needs are our mission - we are committed to providing you with service that fully meets your requirements! WF-8955-AD,WF-8955-MBA,WF-8955-AD,WF-8955-AD-MBA,WF-8955,WF-8945-MBA,WF-8945-AD,55AMP RV Power Converte,55AMP RV Power Converte,wf-8955an power converter,wf-8955pec power converter