Having loose terminals will cause a buildup of heat resulting in damage to the battery. 12V 18AH Lithium Replacement Battery for 6fm17 6-dzm-20 6-fm-18 The ML18-12LI will take your deep cycle battery experience to a whole new horizon. Do not connect in series. Make sure to only use a compatible lithium charger for this battery and tightly screw the terminals.
.Mighty Max Lithium Iron Phosphate LiFePO4 engine start batteries are designed to replace Flooded, AGM, and Gel cell lead acid batteries in Power Sport applications such as motorcycles, ATVs, personal water craft, lawn mowers, utility vehicles, scooters, and dirt bikes.