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Monster Marine Lithium 12V 120Ah Battery w/ Bluetooth

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Original price $899
Original price $899 - Original price $899
Original price $899
Current price $849
$849 - $849
Current price $849

Often Purchased Together

Are you looking for a lightweight battery to power your 12V electronics or trolling motor? Well look no further this is it! Weighing in at only 33 lbs. Did I mention this MML-12120B has a advanced bluetooth technology to view your battery voltage and capacity right from your smartphone. Not only will it save you room but it also cuts your weight by about 60%! 

The MML-12120B battery is in a group 31 case 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. 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! Up to 3 batteries can be wired in series for 24v & 36v trolling motors for 120Ah of capacity! 

Bluetooth functionality so you can view battery status via Bluetooth app!


5 Year Warranty



120 ampere hours (Ah). Monster Marine batteries provide consistent power for all 120 amp hours. 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.


1560 Watts (Wh)


13.00" L x 6.77" W x 8.66" H 

Group 31 equivalent, LBS aluminum battery trays available on our website. 


33 lbs

F12 terminals (posts that screw in)


Over 4000+ Charge cycles. Monster Marine batteries last so long that the price per use is a fraction of traditional batteries.


100A max continuous discharge amps.


Charge volts 13.8. A SLA charger may work, but will reduce performance and lifespan of the battery.


LiFePO4 charger sold separately, compatible chargers sold on our website.


This is a deep cycle 12v battery. Not designed for starting gasoline engines.

 Suitable For

  • All 12V electronics (preferred because of steady voltage)
  • 12V trolling motors
  • Connect up to 4 in series for 24, 36, or 48V 80Ah capacity
  • Connect in parallel for higher capacities
  • LiFePO4 replacement for 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
  • Built in display for battery capacity

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