Attwood Marine On-Board Battery Maintenance Charger, 12V, 1.5A, 1-Bank, Water-Resistant

Overview

The Attwood Marine 11900-4 is a 12V, 1-bank battery maintenance charger that delivers a 1.5 amp maintenance charge for a single battery. It is a fully automatic onboard unit with LED status indicators, which makes it a practical choice for boats that sit between trips, stay on a trailer, or spend part of the season in storage.

Its water-resistant construction, reverse polarity protection, and short circuit protection make it better suited to protected onboard mounting locations than a basic indoor-only maintainer. This charger is built for charge maintenance rather than fast recovery charging, so it fits best when the battery is already serviceable and the goal is to keep it topped up and ready.

Key features

• 1.5 amp maintenance charge for a single 12V battery
• Fully automatic charging cycle for long-term battery upkeep
• 1-bank setup for straightforward use on boats with one battery to maintain
• Water-resistant housing for protected onboard mounting areas
• LED status indicators for quick charge-status checks
• Reverse polarity and short circuit protection during connection

Installation and fit

This charger is a good match for a boat with one 12V battery that needs steady maintenance charging, such as a starting battery on a runabout, a single battery on a small fishing boat, or a light house battery on a sailboat. The onboard format works well when you want the charger left in place instead of reconnecting a portable unit before every outing.

Plan to mount it in a protected location with access to AC power and a clean cable route to the battery posts. On open boats or in areas that see regular washdown, it still makes sense to place the unit where it is shielded from direct spray and standing water.

Electrical and system integration

This model is intended for 12V systems only and handles one bank. That matters on boats with separate starting and house banks, because it is not a replacement for a multi-bank charger when more than one battery needs to be maintained at the same time.

It suits owners who keep a battery connected during layup, between weekend trips, or while the boat stays at the dock with shore power available. For heavily discharged batteries or larger charging demands, a higher-output charger would usually be the better fit.

Shipping
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Processing and dispatch
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Delivery and tracking
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Duties, taxes, and support
International customers are responsible for any customs duties, taxes, and fees charged by the destination country. If these charges are refused and a shipment returns to us, the carrier’s return cost and any re-entry customs fees will be deducted from the refund. If your order is late or you need help, contact cs@qualityboatparts.com and we will assist you.

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Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.

To start a claim, the customer must contact the manufacturer and follow their process. Keep your proof of purchase and original packaging, and register the product if the manufacturer requires it, as these are often needed for warranty service.

We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.