Buy an Enerdrive 40 amp . Will do all batteries plus lithium. I do not believe any advertising regarding drop in replacements. I saw one sold as a drop in replacement...read the fine print and it stated that at least once a month a dedicated lithium charger should be used to ensure cells remained balanced. . Even wet cell, agm and deep cycle have different charging requirements...then to say just drop a lithium in..she,ll be right......not for me. Few extra dollars I,ll have a dedicated charger that covers all battery types.