ABYSS® On-Board 36V 20A High-Precision Marine Lithium Battery Charger

Original Price: $499.99   Current Price: $499.99

  • 43.8V
  • 20A
  • LiFePO₄
  • IP65 SEALED

SKU: AB-CRG-36V20A
  • 20A charging for 36V LiFePO₄ batteries
  • IP65-rated marine construction
  • LED charging status indicators
  • Overcharge, temperature, and reverse-polarity protection
  • 2-year free replacement warranty
Voltage:
Amp:
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  • 2-Year Free Replacement Warranty
  • Free Shipping
  • Designed in Florida

Add Accessories

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    SHARK™ Bi-Directional DC-DC Charger
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    Original Price: $999.99   Current Price: $999.99
  • 3 bank battery charger for marine 12V and 36V batteries with multiple cables and mode selection
    ABYSS® 3 Bank 12V/36V On-Board Marine Battery Charger
    AB-CRG-12V/36V-3B
    Original Price: $699.99   Current Price: $699.99
Product Overview

CHARGE WITH CONFIDENCE

Get your boat ready for your next day on the water. ABYSS® Single-Bank Marine Battery Chargers deliver dependable onboard charging, with a 12V 40A model for house batteries and dedicated 24V and 36V models for lithium trolling motor batteries.

Built for marine use, these chargers combine durable construction with intelligent charging technology and built-in safeguards to help protect your battery throughout the charging process. Choose the model that matches your battery’s voltage, chemistry, and charging requirements for dependable performance between trips.

Whether you’re recharging after a full day of fishing or preparing for an early launch, ABYSS® keeps charging straightforward. Backed by a two-year warranty, each charger is a dependable addition to your boat’s power system.

Specifications

  • Electrical16 specs
    Charger type
    On-Board AC Marine Charger
    Power source
    AC shore power
    Input voltage
    100–240 VAC, single phase
    Input voltage range
    90–264 VAC
    Input frequency
    47–63 Hz (50/60 Hz)
    Max input current
    16 A at 100 VAC, full load
    Nominal battery voltage
    36 V
    Charge (output) voltage
    43.8 V DC ± 0.3 V (3.65 V/cell × 12)
    Charge current
    20 A ± 5%
    Rated output power
    876 W
    Number of banks
    1
    Output configuration
    1 × 36 V / 20 A
    Battery chemistry
    36 V (12S) LiFePO₄ with integrated BMS
    Charge profile
    Automatic CC/CV — constant current → constant voltage → auto-shutdown at full charge
    Termination current
    1.0–2.0 A (output switches off)
    Efficiency
    > 88% at 230 VAC, full load
  • Mechanical & Connections9 specs
    Dimensions (L × W × H)
    11.6 × 4.8 × 3.33 in (295 × 122 × 84.6 mm)
    Weight
    7.7 lb (3.5 kg)
    Housing
    Die-cast aluminum, black anodized, sealed
    Cooling
    Active — 80 × 80 × 15 mm fan on the fin stack
    Mounting
    4 slotted feet, 0.28 in (7 mm) slots on 10.63 in (270 mm) centers; M6 / ¼ in fasteners
    AC connection
    IEC 60320 C14 inlet with sealing cover; detachable NEMA 5-15P → C13 cord (SJT 16 AWG, ≈ 5 ft) included
    DC connection
    2 × 12 AWG leads, ≈ 59 in (1.5 m), red (+) / black (−), M8 (5/16 in) ring terminals
    Status indicator
    Tri-color LED (green / blue / red) on the DC-output end
    What's in the box
    Charger with pre-terminated DC leads, NEMA 5-15P → C13 AC cord, product manual & data sheet
  • Environmental, Protection & Warranty9 specs
    Ingress protection
    IP65
    Operating temperature
    14 to 104 °F (−10 to 40 °C)
    Storage temperature
    −40 to 158 °F (−40 to 70 °C)
    Relative humidity
    5–95% non-condensing
    Protections
    Short-circuit; Over-voltage (≥ 1.05 × Vout); Over-current (≥ 1.1 × Iout); Reverse polarity; No-load; Over-temperature
    Ignition protected
    Yes
    Certifications
    CE, FCC, ABYC compliant
    Compatible batteries
    ABYSS 36V 60Ah, 75Ah and 105Ah trolling motor batteries and SEAL™ 36V 105Ah; two in parallel
    Warranty
    2-year free replacement, then 35% off a replacement through year 5 (manufacturing defects)
ABYSS® 36V20Amp Charger

Key Features

DETAILS THAT MAKE THE DIFFERENCE...

  • Smart AC Charging

    Controlled charging gets your batteries ready for the next trip.

  • Built-In Safeguards

    Voltage and temperature protection help safeguard your battery during charging.

  • Built for Marine Environments

    Rugged construction is designed to withstand moisture, vibration, and the everyday demands of life on the water.

  • Dedicated Single-Bank Design

    Purpose-built to charge one compatible battery bank, providing a focused charging solution for your onboard power system.

  • Smart AC Charging

    Controlled charging gets your batteries ready for the next trip.

  • Built-In Safeguards

    Voltage and temperature protection help safeguard your battery during charging.

  • Built for Marine Environments

    Rugged construction is designed to withstand moisture, vibration, and the everyday demands of life on the water.

  • Dedicated Single-Bank Design

    Purpose-built to charge one compatible battery bank, providing a focused charging solution for your onboard power system.

Learn Before You Launch

Learn more about Buying Guide

Buying Guide

Pick the right battery

Learn more about Charging Tips

Charging Tips

Maximize cycle life

Learn more about Installation Gallery

Installation Gallery

See real builds

The Abyss advantage

  • 100% Usable Capacity

  • Unwavering Power

  • Exceptional Voltage Stability

  • Compact, lightweight design

Customer Reviews

Highly-rated 36V 20A marine lithium battery charger praised for fast charging speeds and reliable auto-cutoff functionality. Customers said it's a "game changer" with plug-and-play ease. Brings batteries to 100% in hours. One customer reported receiving wrong charger (10A instead of 20A). Pairs excellently with trolling motors.

  • 5 stars: 11 (92%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 1 (8%)
T
Todd Schultz

The best!

P
Peter Miller (Miami, US)

Perfect set up

S
STEPHEN Purul (Manahawkin, US)

Excellent product and excellent service!!!

D
Dan Hall

Does exactly what it was intended to do. Brought my battery up to 100% in a couple of hours. Auto cutoff works great!!

J
Jamie Robinson (Wawa, CA)
36 volt 105ah

After 2 weeks of use very impressed with the capacity left. Fished 20 hours over 3 days of on the water time with light winds and battery stilled had 73% left. Also fished 2 8 hour tournament days of non stop usage in 30 to 40mph winds and the battery had 73% after day one and 79% after day 2. My trolling motor is a Minn Kota Ultrex Quest pushing a 1963 MirroCraft Aggressor and the motor is on 6 power constantly searching for fish with forward facing sonar.

G
Gary Huggins (Indian Rocks Beach, US)
what a game changer

Love the 20 amp charger. what a game changer. Plug n play is the way to go!!

J
John Amacher (Saint Paul, US)
ABYSS® 36V 105Ah Lithium Trolling Motor Battery

I was up at the lake of the woods fishing for last day and a half, I have Minnkota
ulterra 112 36 volt. both days I was spot locked in some pretty good wave action, this was my first trip with the new trolling motor and battery, so I kept a close eye on My battery charge and was amazed, at the end of the trip the battery was still had 76% charge. first day spot locked from 1pm to 7pm and second day from 8 am to 8;30 pm, the wave action averaged 2 to three feet wind was 17 to 25 MPH. I had the charger with but never had to use it.
Pretty funny while walking back from the fish cleaning shack the number of boats that had power cords running to them, but not mine one less thing to put away before starting your day. Oh, and by the way when the battery came it wasn't charged it took less than three hours to charge it, I also purchased the charger as well plugged it in the red light came on and when the battery was the charge the green light came on and the charger shut off on its own, I unplugged it and was good to go. Oh, by the way thanks fast order fulfillment, less than a week from Florida to Minnesota with standard shipping.

Thanks,
John A

R
Rodney Finnefrock (Fort Myers, US)
Charger

I did not receive the 20 amp charger as ordered. Instead, they sent me the 10 amp charger, without any notification of change of order .

J
Jeffrey Mcinnish (Austin, US)
Excellent Charger

I use the Abyss 36V 105AH battery with a Rhodan 120 lb thrust trolling motor. This charger is permanently installed on my Key West 244 CC and keeps the battery at tip top shape. If you are buying an Abyss battery, this is the charger to use. It just works and is build very solid. I do not use engine power to recharge, only this charger. It gets a workout and is blistering fast at recharges.

D
David Norton (Charlotte, US)
Great addition to my Lund Tyee Magnum 2075

Although it took a while to get my new battery and charger, the performance has been amazing with a 36v Motorguide Xi5 electric motor! 105 AH battery with 4 x 5 hour trips trolling for walleye at 1.5 MPH still at 37% SOC! Love the Bluetooth data on my phone to monitor battery performance.

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