What specifications do lithium-ion batteries need to meet to be approved for use with Mercury Marine® outboards?

---

Mercury Marine® recently released a bulletin regarding the use of lithium-ion batteries for starting engines. To ensure boaters achieve optimal performance from Mercury Marine outboards, they now allow the use of lithium-ion starting batteries for an approved list of outboard models. In addition, any lithium-ion battery being used must meet these certain specifications:

• Chemistry: Lithium Iron Phosphate (LifeP04) is designed for marine cranking use.
• Minimum Cranking Amps: 800 Amps for 8 seconds minimum at 20 °F (-7 °C)
• Peak Charge Acceptance: 165 Amps I 20–130 °F (-7–55 °C)
• Max Charge/Alternator Size: 150 Amps I 20–130 °F (-7–55 °C)
• Max Charge Voltage/ Alternator Output: 14.8 V
• Reserve Capacity: (RC25@ 80 °F) 135 minutes
• Ingress Protection (IP) Rating: IP67 or greater

---