HIGH-PERFORMANCE AND DURABLE LITHIUM BATTERY FOR ELECTRIC BOATING! The chemistry of E-Series batteries is LiFePO4, offering a weight reduction of 30% and around 50% higher usable capacity compared to AGM lead-acid batteries. What’s more, LiFePO4 batteries boast a lifespan of up to 3000 cycles, while AGM batteries only last between 300 to 500 cycles. Why Choose The E163Battery: High Performance -E163 (single battery) can support Navy 6.0 Evo (9.9HP) full power output. High Reliability- All-metal housing is more reliable, weather resistant, impact resistant and drop proof. SPECS: