MarCum® M5L – Lithium Equipped Flasher System


The most advanced flasher-sonars ever built, the MarCum® “M” Series offers brushless, dead-quiet operation with dazzling bright and crisp color definition of bottom, fish, baitfish and your lure, all illuminated on the highest resolution display available in a commercial grade flasher. Acute .75-inch target separation distinctly identifies each individual object on the screen, so you can clearly discern the minuscule separation of a bluegill about to kiss your ice jig.

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SKU: 850013782024.
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The difference between a good angler and a great one is their attention to detail. The M5L provides that element in a 3-color, real-time flasher that’s as scientifically advanced today as it was when released nearly two decades ago. Feature specs are useless unless they help you catch fish, which is why the M5L’s strength of signal with target separation down to 3/4″ is more than just a bullet point on a product box. That kind of sonar clarity allows you to differentiate fish from the bottom, or schooling fish from each other, to specifically target the largest fish in the group and catch them. With our dual-beam transducer, at the push of a button, an angler can quickly narrow the sonar cone angle and focus on fish within any striking distance of the bait. SuperFineLine (SFL) is another Marcum-exclusive, and it’s like having a High Definition mode for your flasher, all while improving standard definition from 1-1/2″ to 3/4″ for the entire water column. Max Brightness and Clarity (MBC) lighting ensures that sonar targets are as bright as they are sharp, digitally transposed on a super-smooth and quiet brushless platform that’s provided years of maintenance-free service. The M5L’s patented zoom technology is moveable anywhere in the water column, giving you the freedom and precision not only for bottom hugging species, but an exclusive advantage only MarCums can boast as it relates to suspended fish. This is true in shallow water ponds, as well as the deepest and clearest lakes down to 160 feet. Our industry-leading 12-step interference rejection system is so advanced, it’s also patented. That makes it compatible with any 200khz frequency sonar, along with other frequencies as well. The M5L’s sonar system pumps out 2,500 watts of expertly managed power, and is now fueled by a lightweight, long-lasting LiFePO4 lithium battery. This shaves a significant amount of the weight from the entire system, ensuring both angler AND flasher never run out of juice. Lithium technology is easy on the pocketbook too, offering lower cost of ownership by extending the life and use of any Marcum for thousands of charge cycles. Like all MarCums, the M5L is sold complete, including a deluxe-padded soft pack that provides years of protection in transit and use. No species of fish can elude the features and performance of the M5L, making it the most universally equipped multi-species flasher on the market.


PHYSICAL DIMENSIONS 8.5″ x 10.5″ x 8.5″
WEIGHT 6.7 lbs.


DISPLAY TrueColor patented MBC
Brushless Lighting
POWER 2500 Watt Peak to Peak
Output Power
CONE ANGLE Dual Beam 8/20 Degree
Ice Transducer
Interference Rejection
ZOOM Patented Infinitely Adjustable Zoom
(Zoom anywhere throughout the water column)
CABLE 8 ft. Transducer Cable
ADDITIONAL FEATURES Selectable Depth Ranges –
20′, 40′, 80′, 160′


BATTERY TYPE Lithium Iron Phosphate (LiFePO4)
VOLTAGE 12.8 Vd.c.
TERMINALS Standard F2 Spade Terminals (6.4mm or 0.25” wide)
LIFECYCLES 2000 Full charge cycles
CHARGING TEMPERATURE 0°C to +45°C (Do not charge a frozen battery)

Circuitry designed to prevent the battery from operating outside its safe operating levels. Includes: over-current & over-voltage protection, regulates operation during high & low temperatures, balanced charging, and short circuit protection.

ESTIMATED RUNTIME* 36 Hours Depending on Conditions
SIZE 5-7/8″ x 2-1/2″ x 3-5/8″ Replaces Standard Lead Acid Battery
WEIGHT 2 lbs. 11oz.

*Runtime estimates are based on power usage with factory default settings. Changes in user settings like screen brightness can have a major impact on power draw and therefore runtimes. MarCum Technologies offer these estimates to aid in determining the size battery you need to meet your use case.


Accessories Included

BATTERY Rechargeable 12-volt 10-amp Lithium LiFePo4 Battery
CHARGER 3-amp Hour Rapid-Charge Battery Charger
STORAGE Deluxe Padded Red Soft Pack
WARRANTY Two Year System Warranty


BMS Protection

Circuitry designed to prevent the battery from operating outside its safe operating levels. Includes: over-current & over-voltage protection, regulates operation during high & low temperatures, balanced charging, and short circuit protection.


  • Do not immerse the battery in water or sea water. Keep the battery in a cool dry place when not in use.
  • Do not use or leave the battery near a heat source (i.e. heater, furnace, fire).
  • Use the battery charger only as directed when recharging.
  • Do not reverse the positive and negative terminals on the battery connections.
  • Do not discard the battery in a fire, furnace, or other combustible space.
  • Do not connect the battery directly to an electrical outlet.
  • Do not short –circuit the battery by directly connecting the positive and negative terminals with metal objects.
  • Do not directly solder the battery or pierce the battery with a nail or other sharp objects.
  • If the battery gives off an odor, generates heat, becomes discolored or in any way appears abnormal during use, or while charging or discharging, immediately stop using it.
  • If the battery leaks and the battery contents (electrolyte) gets into an eye, do not rub the eye. Instead, flush the eye(s) with clean water and immediately seek medical attention or it may result in injury to the eye(s).
  • Do not use the battery in a location where static electricity or magnetic fields are great or it may result in damage to the battery safety devices.
  • Do not leave the battery in high temperatures (i.e. in direct sunlight or in a vehicle in extremely hot weather) or it may overheat, and its performance will be degraded, and service life decreased.
  • Tape the battery terminals prior to disposal to insulate them as discarded batteries may cause fire or explosion.
  • Follow manufacturers instructions.
  • Do not charge a frozen battery.
  • Charging Temperature: 0°C to +45°C.


Manual for the MarCum M5L Flasher System
Download for Free! Click on link M5L Manual

Quick Start Guide for M5L Flasher System
Download for Free! Click on link M5L Quick Start Guide




Manuel en français pour le système MarCum M5L Ice Sonar
Télécharger gratuitement! Cliquez sur le lien M5L Manuel de l’utilisateur