Monster Marine Lithium | 12V 120Ah Bluetooth Lithium Deep Cycle Marine Battery MML-12120B (w/ bluetooth)
12V 120Ah Bluetooth Lithium Deep Cycle Marine Battery – MML-12120B
Maximum Capacity. Smart Monitoring. Built for Marine Power.
The MML-12120B is a 12V 120Ah Bluetooth Lithium Marine Battery built for serious anglers, boaters, and outdoor enthusiasts who demand reliable power and real-time monitoring. Weighing just 33 lbs and housed in a Group 31 case, it’s a lightweight, high-performance solution with LiFePO4 (Lithium Iron Phosphate) technology at its core.
Stay in control with Bluetooth monitoring—view voltage, capacity, and status directly from your smartphone using our free iOS or Android app. Whether powering electronics or a trolling motor, this battery delivers twice the power, four times the life, and about 60% less weight than traditional lead-acid batteries.
Key Features:
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High Capacity – 120Ah
Extended run times for long days on the water. -
Bluetooth Monitoring
Track real-time battery health and status via smartphone. -
Group 31 Drop-In Fit
Perfect replacement for most marine battery compartments. -
Super Lightweight (33 lbs)
Easy to transport, install, and reduces onboard weight. -
Advanced LiFePO4 Chemistry
Safer, longer-lasting, and more efficient than SLA batteries. -
Built-In Capacity Display
Instantly see charge level right on the battery. -
Plug-and-Play Installation
Just connect positive and negative cables—no complex wiring. -
Series Capable
Wire 2 or 3 batteries in series for 24V or 36V systems, maintaining 120Ah capacity.
Ideal For:
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12V Trolling Motors (All Major Brands)
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Kayak & Fishing Electronics
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RVs, Boats, and Off-Grid Systems
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SLA Group 31 Battery Replacements
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Long-Lasting Outdoor Power
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4000+ Charge Cycles for Years of Use
Charger Compatibility:
Use any AGM-compatible charger from trusted brands like:
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Minn Kota (Precision & Digital)
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Dual Pro
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NOCO
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Real Pro
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Pro Sport
All chargers must support AGM mode.
Specification
Weight
33 lbs (14.9Kg). 60% lighter than 1 SLA battery!
Size Dimensions
L 13 in (330mm) x W 6.77in (172mm) x H 8.66 in (220mm)
Voltage
12V
Energy
1560 Watts (Wh)
Amp-Hours
120Ah
Charge Volts
13.8v
Continuous Amps
100A max
Terminals
F12 terminals (post that screw in).
Are Solar Guys Pro Authorized Retailers?
Yes! We are proud to be one of the few online retailers who are authorized retailers for every single product we carry!
When Will My Order Ship?
Most orders ship within 1–3 business days. You’ll get a tracking number as soon as it ships via email!
Do We Accept Returns?
Yes absolutely, we have a no-hassle, 30-day return policy on all items! To refer to the full policy, click HERE
Are Products Brand New?
Yes! All products on Solar Guys Pro are 100% brand-new and in perfect condition.
We do not sell any used or refurbished items.
Frequently Asked Questions
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