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VMAX MR137-120 12V 120Ah AGM Deep Cycle Hi Performance Battery

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Your Price: $264.99
VMAX MR137-120 12V 120Ah AGM Deep Cycle SLA Group 31 Marine Battery
Part Number: MR137-120
Availability: Back Order. Free Shipping.
Quantity Price
2 - 4 $257.04
5 - 10 $249.09
11 - 15 $246.44
16+ $241.14
VMAX MR137-120
12-Volt 120Ah AGM Deep Cycle
High Performance Battery

Voltage: 12 Volt
Capacity(Amp Hours @20-Hr Rate): 120Ah
RC (min): 230
Hot Cranking Amps: 1740A
Marine Cranking Amps: 900A
Terminals: 8mm (included)
Dimensions (inches): 12.9"L x 6.8"W x 8.7"H
Weight: 75lb
Charging Current: 7A-35A (a smart charger is recommended)
Charging Voltage: 14.4V-14.9V
Float Voltage: 13.5V-13.8V


  • AGM Electrolyte Suspension System
  • Maintenance free Operation
  • No Dangerous Fumes or Gases
  • Fast Charge Delivery Capabilities
  • Custom Built Military Grade Alloys
  • Extremely Low Self Discharge Rate
  • Approved for Mobile, Maritime and Air Travel
  • Extreme Vibrations, Heat and Weather resistant
  • Sealed, Non-Spillable, Non Hazardous Construction
  • Maximum Power Density and Deep Cycle Capabilities

Charging Options:

  • Smart / Microprocessor controlled charger.
  • Alternator: 14V-15V14V-15V.
  • Solar Panel: 175W-450W.
  • Charge Controller: 20A-UP

Operating Temperature Range:

  • Discharge: -4~140F
  • Charge:     14~140F
  • Storage:     -4~140F

Temperature Compensation:

  • Cycle use:     -30mV/C per Cell
  • Standby use: -20mV/C per Cell

UPC: 804879255352

BCI Group Code: 31 [(+) on L.H.S. & (-) on R.H.S)

All VMAXTANKS AGM batteries feature:

  • Sealed Construction
    The unique construction and sealing techniques of VMAX tanks guarantee leak proof operation in any position with no adverse effect to capacity or service life. VMAX tanks are classified as non-spill able, non-hazardous, dry batteries making them NOT restricted for Surface, Maritime and Air Transport.
  • Electrolyte Suspension system
    VMAX tanks utilize an electrolyte suspension system consisting AGM (Absorbed Glass Matt) of a high porosity that totally absorb and contain the electrolyte. No silica gels or any other contaminants are used.
  • Maintenance Free Operation
    There is no need to check specific gravity of the electrolyte or add water to
    VMAXTANKS™ during float service life.
  • Reliable, Rugged Construction
    The extra strong ABS container reduces case bulging and plate warping, ensuring long life and high performance.
  • Low Pressure Valve Regulated System
    VMAXTANKS™ are equipped with safety release valves, designed to operate between 0.98-196.1kpa and automatically reseal. Hence, there is never an excessive accumulation of gas within the battery.
  • Heavy Duty Military Grade Grids
    Heavy duty lead tin alloy grids provide an extra margin of performance and service life in either float or cyclic applications, even after repeated over discharges.
  • Cyclic Service Life
    VMAX is known to deliver one of the highest numbers of discharge / recharge cycles. Depending on the use and average depth of discharge it can offer an average of:

    Number Of Cycles Depth of Discharge
    300 100%
    600 75%
    900 50%
    1500 25%
    3500+ 10%
  • Float Service Life
    VMAXTANKS™ have an expected life span of 8 to 10 years in float service applications.
  • Low Self Discharge
    The self discharge rate of the new VMAX tanks at room temperature is approximately 1-2% of rated capacity per month (compared to 2-3% for most other AGM batteries and 15-20% for Lead Acid batteries).
  • Operating Temperature
    VMAXTANKS™ may be operated over a broad range of ambient temperatures.
  • Ultra Low Resistance
    VMAXTANKS™ Ultra Low Resistance make it up to 99% efficient (compared to 85-95% as in Lead Acid Batteries and 97% in most other GEL and AGM batteries).
  • Higher Power Density
    A special assembly technology is used to enhance power density to a considerable level.
Don’t settle for an average Lead Acid Battery, upgrade to a VMAX CHARGE TANK premium AGM deep cycle battery!

Customer Reviews:

5.0 out of 5 stars Five Stars, January 19, 2015
  Verified Purchase(What's this?)
Zero complaints at all after almost 18 months.

5.0 out of 5 stars Great Battery with a lot of storage power, October 27, 2013
  Verified Purchase(What's this?)
"So far so good... this has been a great battery with a ton of storage power for my 55lb thrust trolling motor. I wanted a battery that would power my boat all day without worrying about having it go dead and standing me across the lake. So far I have been out several times almost continuously using the battery for six hours or more and have had plenty of power. Of course I have a high efficiency Minn Kota Endura Max motor matched up to it... Works Great!! Don't forget to buy a high quality AGM charger to protect your battery investment and it should last a long time."

5.0 out of 5 stars Has held up perfect., June 26, 2013
  Verified Purchase(What's this?)
"Plenty of power and takes charges well. built like a tank. Would recommend to anyone. more amp/hours than any other brand I could find."

5.0 out of 5 stars Well built has good charge and discharge profiles., May 10, 2014
  Verified Purchase(What's this?)
"I purchased 2 of these to run my motorhome when the generator isn't running. They are working well so far. They are certainly working better than the flooded battery they replaced."

5.0 out of 5 stars I've used it several times now and am very happy with it, August 3, 2014
  Verified Purchase(What's this?)
"I bought this for an ArkPak. I've used it several times now and am very happy with it. I was able to run a Fantastic DC fan (mostly on low but occasionally on medium and high but running 72 hours straight), recharge a 15" Macbook Pro laptop several times and charge two iPhones several times. I also used it to top off a charge in a Goal Zero Lighthouse 250. The output was 12.7 volts to start and only dropped to 12.3 volts over the 72 hours. I am very pleased because I was hoping to get a three day weekend's worth of camping out of it while not dropping the output voltage below 11."

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