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ProMariner

ProMariner 44020 ProSport HD Waterproof Marine Battery Charger, 20 Amp, 2 Bank

  • Based on 272 reviews
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Availability: Only 10 left in stock, order soon!
Fulfilled by KART IT
Arrives Jul 23 – Jul 27
Order within 10 hours and 14 minutes
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Pattern Name: Charger


Style: 12/24V, 20 Amp, 2 Bank


Features

  • ProSport HD 20A Dual Bank Waterproof Marine Battery Charger (part number 44020) replaces the old ProMariner Gen 3 ProSport 20 (part number 43020)
  • ProMar Digital Technology: Microprocessor and software controlled charging technology for fast, precise charging
  • Distributed-On-Demand Technology: 100% of all available charging amps are utilized by distributing unused charging amps to any one or combination of all batteries as needed
  • Heavy Duty Tri-Surface Extruded Heat Sink Design: Upper, lower and rear facing heat sink design for optimal cooling while delivering true rated constant current charging amps during its two charge mode
  • Expanded LED Display with Completion Status Gauge: LED fuel gauge style completion status. Four color multi-stage mode LED status bar. Multi-stage Charge Mode, System Check OK, individual Battery Status and Battery Type indication

Description

The new ProSport HD features a lightweight, tri-surface heatsink design. This delivers significantly faster charging through optimal cooling, while delivering true rated constant current charging amps during charge mode. Fully automatic multi-stage charging enhances battery performance while extending battery life.

Brand: ProMariner


Color: Gray/ Yellow


Product Dimensions: 8.7"D x 16.4"W x 6.3"H


Item Weight: 8.64 Pounds


Output Voltage: 12 Volts


Output Voltage: 12 Volts


Input Voltage: 120 Volts


Current Rating: 20 Amps


Amperage: 20 Amps


Connector Type Used on Cable: CIGA (for battery), AC power cord (for power supply)


Number of Ports: 2


Item Dimensions D x W x H: 8.7"D x 16.4"W x 6.3"H


Item Weight: 8.64 Pounds


Specification Met: UL, FCC


Color: Gray/ Yellow


Brand: ProMariner


Mfr Part Number: 44020


Global Trade Identification Number: 03


UPC: 031669440203


Manufacturer: ProMariner


Model Number: 44020


Item Type Name: boating-battery-chargers


Built-In Media: Battery charger, AC/DC power cables


Unit Count: 1.0 Count


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Jul 23 – Jul 27

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Works well, a good smart charger... be sure to run separate cables for each battery
Pattern Name: Charger Style: 12/24V, 8 Amp, 2 Bank
Replaced my old Guest unit which had failed (due to my mistake, running the engine while charging). The old unit used one common ground wire for both batteries. After checking on a couple boat wiring forums, I decided this unit would work better by running a separate ground for each battery. Even though the batteries' grounds are connected at the battery bank, I learned that the individual ground wire for each battery will allow it to monitor and charge each battery individually, to account for different charge levels. That's the theory anyway... I'm still not sure it's correct, but the manual says to have individual +/- for each battery too. So that's what I did, and ran another ground. Other than that installation was pretty easy. I like the charging cycles, IIRC there are 5 "smart" stages, I've been a fan of those smart chargers for years, my batteries seem to last longer with them. The last stage is maintenance, so I'll just leave it connected over the winter. All in all I like it a lot. I'm pretty sure my old Guest unit failed while running and charging simultaneously, I had it for years but this was the first time I'd forgotten to stop charging before running the engine. But I've seen varying opinions on whether that's possible or probable. Regardless, I will never charge and run simultaneously again, just in case. Word to the wise... ... show more
Reviewed in the United States on September 16, 2021 by TW
    • Charged
Pattern Name: Charger Style: 12/24/36V, 20 Amp, 3 Bank
Worked great. Easy to install. Fit perfect
Reviewed in the United States on April 13, 2026 by CDG_BMW
    • Great Product Great Product
Pattern Name: Charger Style: 12/24V, 20 Amp, 2 Bank
Review Image by Matt
I had the original version of this charger in our Crownline for 8 years and loved it. It worked perfectly, and kept the original batteries that came with the boat working great for that entire time. That is, until it got struck by lightning... So I ordered this, updated version of the same charger. It is exactly as nice as the old one with some nice upgrades including the charging gauge and the easier method of selecting the battery chemistry. I was extremely happy with the first one and would still have it if not for our mishap. I expect this one will carry on as the old one did, keeping my original batteries topped up when the boat is sitting. ... show more
Reviewed in the United States on June 11, 2025 Reviewed in the United States on June 11, 2025 by Matt
    • Great charger
Pattern Name: Charger Style: 12/24V, 12 Amp, 2 Bank
So far this appears to be working great, charging and maintaining my boat batteries Easy to use with clear directions, easy to install
Reviewed in the United States on October 26, 2025 by BigG
    • Easy to connect and it is super quite.
Pattern Name: Charger Style: 12/24/36V, 20 Amp, 3 Bank
This is the second unit I have purchased. The first worked great but I hade a major short circuit that fried one of the 3 leads. the unit performs as listed in their promo
Reviewed in the United States on May 17, 2026 by Leo D. Peloquin
    • BATTERY TYPE SELECTION
Pattern Name: Charger Style: 12/24V, 20 Amp, 2 Bank
I installed this unit today. The unit appeared very good and installed easily apart from the fact that access to my batteries and the installation site in my boat is limited. The unit provides the ability to select the type of batteries used.. i.e. Flooded cell, AGM and Gel. The default is flooded cell. My batteries are AGM and I had a hard time selecting that type. The selection can only be made when the Mode Light is pulsating blue. In my case the pulse lasted only about one second which is insufficient since during that time one has to hold the selection button 2 seconds and then cycle through the different types. Then hold the button another 2 seconds. My batteries in fairly good shape and it didn't take long for the unit to do its preliminary checks, thus the blue light became steady fast. I assume that this procedure will be requited each time the unit is plugged in. I will call the manufacturer after the holidays to get an explanation. ... show more
Reviewed in the United States on December 24, 2020 by Jane Lonchambon
    • Great charger for the money!
Pattern Name: Charger Style: 12/24V, 20 Amp, 2 Bank
This has held up for 2 years now.
Reviewed in the United States on May 6, 2026 by Ian C
    • Great charger
Pattern Name: Charger Style: 12/24V, 20 Amp, 2 Bank
Works great
Reviewed in the United States on December 23, 2025 by Benny M.

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