Invest in power with the mighty max 6.4V 4.5ah lithium iron phosphate b'attery. The ML4-6LI will take your deep cycle battery experience to a whole new horizon. Manufactured with the highest quality components and the customers safety in mind, this battery contains a battery management system (BMS). BMS provides all kinds of protection for the battery and customer, equipped with Over charge and short circuit protection. Weighing only 0.50 lbs. and being a direct drop in replacement for its sister sealed lead acid and Gel batteries which weigh a hefty 1.35 lbs. Lighter, stronger and longer life span with 2500 cycles makes this the ideal battery for all your deep cycle applications such as, solar / wind energy systems, Off grid systems, RV, camping, backup power systems and much more. Attention - designed to be used in parallel with a maximum of 4 identical batteries. Do not connect in series. Make sure to only use a compatible lithium charger for this battery and tightly screw the terminals. Having loose terminals will cause a buildup of heat resulting in damage to the battery.