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ProMariner

ProMariner 44021 ProSport HD Waterproof Marine Battery Charger, 20 Amp, 3 Bank

  • Based on 793 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Parts Via
Arrives Monday, Oct 6
Order within 12 hours and 12 minutes
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Pattern Name: Charger


Style: 12/24/36V, 20 Amp, 3 Bank


Features

  • ProSport HD 20A Triple Bank Waterproof Marine Battery Charger (Part Number 44021) replaces the old ProMariner Gen 3 ProSport 20 plus (part number 43021)
  • 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: Unspecified


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


Item Weight: 7.2 Pounds


Output Voltage: 36 Volts (DC)


Product Dimensions: 16.4 x 8.7 x 6.3 inches


Item Weight: 7.2 pounds


Item model number: 44021


Batteries: 1 Unknown batteries required.


Date First Available: November 22, 2019


Department: Unisex-Adult


Manufacturer: ProMariner


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Oct 6

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.

  • Klarna Financing
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  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Works great
Pattern Name: Charger Style: 12/24/36V, 20 Amp, 3 Bank
Simi easy to install and get hooked up. Works great..
Reviewed in the United States on August 5, 2025 by Keith Cater
    • Money well spent!
Pattern Name: Charger Style: 12/24/36V, 20 Amp, 3 Bank
Review Image by Bob411 Bob411
These ProSport chargers are the best. This is the third unit I’ve had on as many boats. I maintain three batteries wired for one 12-volt circuit and one 24-volt circuit. Not only are my systems always charged, keeping the batteries fully charged and not allowed to discharge to a critical level has extends their life. Just as important is the customer service. Every time I contacted them, I received a response in 24 hours and had my issue solved in a quick friendly manner. Go for it, you won’t be sorry! ... show more
Reviewed in the United States on September 21, 2024 by Bob411 Bob411
    • Super Impressed
Pattern Name: Charger Style: 12/24/36V, 20 Amp, 3 Bank
Unit is great in appearance! Operates as advertised. Found and isolated a defective battery in my boat right away. So far, an impressive unit!
Reviewed in the United States on June 17, 2025 by Tom Rust
    • Great battery
Pattern Name: Charger Style: 12/24/36V, 20 Amp, 3 Bank
Battery works great. Easy and convenient
Reviewed in the United States on August 5, 2025 by Hannah H
    • Replacement
Pattern Name: Charger Style: 12/24/36V, 20 Amp, 3 Bank
Replaced an older unit. Same model as previous one. This one a little bigger than original. Had to drill new holes and mount upside down.
Reviewed in the United States on August 23, 2025 by White Oak Mkt
    • Same part number but different charger
Pattern Name: Charger Style: 12/24/36V, 20 Amp, 3 Bank
I bought this item because it was suppose to charge life pod also I bought it a couple of years ago but didn’t have life pod batteries then but it was for a further use Now I have life pod only to find out the unit they sent s the exact same part number but it doesn’t charge life pod these are great chargers but I feel like I got ripped off and they sent me one of the ones that wasn’t equipped for lithium. It’s looks the same and what I bought wasn’t the same I thought the lithium light didn’t light up til you actually hooked it up to a life pod battery ... show more
Reviewed in the United States on March 15, 2025 by Amazon Customer
    • ,Good value, easy install instruction, but
Pattern Name: Charger Style: 12/24/36V, 20 Amp, 3 Bank
Initial start uu ok. A week or so later (new) batteries were flat. No fault ead on panel. Traced to a loose ground wire on one battery. Seems to me there should have been a panel redout code so indicating (a common problem), would have saved much diagnosis and tracing time!!
Reviewed in the United States on November 18, 2023 by David Lambert
    • Pro Mariner 3 Bank Triple Charger
Pattern Name: Charger Style: 12/24/36V, 20 Amp, 3 Bank
It all of a sudden stopped working one day, I called the warranty department and it was replaced with no problems. It worked great until it stopped working. Replacement works great also so far no issues. Would recommend this item.
Reviewed in the United States on April 13, 2025 by Mudgirl

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