Monster Marine Lithium 36V 73AH Deep Cycle Battery w/ Bluetooth [MML-3673B]

Charger: No
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Are you looking for a lightweight battery to power your 36V trolling motor? Well look no further this is it! Weighing in at only 50lbs, this ONE battery can replace THREE regular marine gel/acid batteries! Not only will it save you room but it also shaves off an estimated 150lbs or more! The MML-3673B battery is in a group 31 case just 1 inch taller so it will fit right where your old batteries previously sat! Built with Lithium Iron Phosphate (LiFePO4) technology this battery has twice the power, a fraction of the weight, and lasts 4 times longer than a sealed lead acid battery. If you're fishing heavy current and needing extra capacity or just simply want the extra juice another 36v battery can be wired in parallel (positive to positive & negative to negative) to increase the amp hour capacity to 146Ah! Installation is as easy as attaching the main positive of the trolling motor to the positive post of the battery and the main negative of the trolling motor to the negative post of the battery. Very simple plug ang play!




In the unlikely event you are having an issue with one of Monster Marine Lithiums batteries they have designed and developed a clear warranty & return policy.


73 ampere hours (Ah). Monster Lithium batteries provide consistent power for all 73 amp hours. MML LiFePO4 batteries have a flat voltage curve, which means they have a steady power output as the battery discharges. The power output will not dramatically drop like similar sized SLA batteries. You get all the juice down to the last drop.




2803 Watts (Wh)


M8 Stainless Bolts


L 13 in (330mm) x W 6.77in (172mm)  x H 9.5 in (241mm)


51 lbs (23.1Kg).


100 A max continuous


BMS stands for Battery Management System. The BMS protects the cells from getting damaged from common over or under voltage, over current, extreme high temperature, external short circuiting. This system will shut off the battery to protect the cells from unsafe operating conditions. All MML batteries have the most Advanced BMS built into the battery to insure protection.​

Suitable for:

  • 36v trolling motors
  • Connect in parallel for 146Ah capacity
  • LiFePO4 replacement for (3) SLA 12v
  • Ideal for Minn Kota Trolling Motors
  • Ideal for Garmin Trolling Motors
  • Ideal for Lowrance Trolling Motors
  • Ideal for Rhodan Trolling Motors
  • Ideal for ALL Trolling Motors
  • Over 4000+ Charge cycles
  • Bluetooth capable


36V 10A Waterproof Lithium Battery Charger
This waterproof charger can be mounted anywhere and is designed to charge 36V LiFePO4 lithium batteries!

Output voltage: 43.8 V 
Charge current: 10 A 
Max Output Power: 600 W 
Input voltage: 110(90-132) Vac  
AC input voltage frequency: 50-60 HZ 
Dimension: 7.5 L×5.75 W×1.5H in 
Weight: 5lbs

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