The powerful RELiON RB300 Lithium Iron Phosphate Battery is ready to replace your heavy lead-acid battery bank in your sailboat, RV, or solar energy system. The RB300 weighs only 82 lbs. and is a true 300 Ah lithium battery that provides 100% of its rated capacity. LightweightRELiON lithium batteries provide more power than lead-acid batteries and are typically half the weight â boosting both performance and agility on the water. More Usable CapacityLead-acid batteries are typically sized up to two times your energy needs to account for extended periods without sun and less usable energy with higher rates of discharge. Plus, you are typically cautioned to limit your use to 50% of the rated capacity, as using more can significantly reduce performance. Lithium batteries provide 100% of their rated capacity, regardless of the rate of discharge. And, you can use it all and still get substantially longer cycle life. Long LifeRELiON lithium batteries provide up to 10 times longer life than lead-acid batteries, and they still provide 80% of the rated capacity after 3, 500 cycles. Fast ChargingRELiON lithium batteries charge much faster than traditional lead-acid batteries, and they're packed with more usable energy and up to 10 times longer life so you're always ready to go. Maintenance FreeRELiON lithium batteries are maintenance-free â no watering, no corrosion. Low self-discharge means the batteries don't lose capacity when they're idle, assuring that you have the energy you need, every time you need it. Partial State of Charge TolerantPartial state of charge, known as PSOC, which is a killer of lead-acid batteries, does not affect performance or battery life of a lithium battery. Sometimes batteries don't get fully charged, or they regularly operate in a partial state of charge. Either way, you can count on RELiON lithium batteries living a long and productive life. Temperature TolerantLithium batteries can handle a wide variety of conditions and are even 2.5x more efficient at low temperatures than lead-acid while being able to safely operate up to 149°F. Constant PowerFull power available throughout discharge. Voltage does not drop like with lead-acid batteries. Electrical SpecificationsNominal Voltage: 12.8 VNominal Capacity: 300 AhCapacity @ 25A: 720 minEnergy: 3840 WhResistance: =30 mO @ 50% SOCEfficiency: 99%Self Discharge: | RELiON RB300 Deep Cycle Lithium Iron Phosphate Battery, Group 8D