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.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Orders of $100 or more qualify for free shipping when eligible. For orders under $100, shipping costs are calculated at checkout based on destination, package weight, and selected service. International shipping is available for eligible products, and certain items may require additional handling, warehouse transfers, or may ship directly from the manufacturer, which can affect processing time.

Deliveries are handled by preferred carriers such as USPS, UPS, FedEx, DHL, and others depending on your location and selected service. Estimated delivery times are displayed at checkout and may vary due to customs processing, carrier delays, weather, postal disruptions, or other circumstances beyond our control. Once your order ships, you'll receive a confirmation email with tracking information. Tracking may take up to 24 hours to update on the carrier's website and is also available through your account when applicable.

We ship throughout the United States and to most international destinations for products eligible for international shipping. International orders may be subject to customs duties, taxes, brokerage charges, or other import fees, which are the customer's responsibility and are not included in the product or shipping price. PO Boxes are accepted only when shipping through USPS, and not all packages qualify for this option. If your order does not arrive within the estimated delivery window, please contact us at info@apollolighting.com or +1 (954) 375-0100 so we can assist with locating your package.

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Returns may be requested within 30 days of receiving your order. Items must be unused, uninstalled, unaltered, and returned in their original packaging with all tags, packing materials, blank warranty cards, manuals, instructions, accessories, and included items. Certain products, including installed or used electronics, electrical components, lighting, consumables, custom or special-order items, cut-to-length products, safety equipment, and merchandise exposed to water or marine conditions, may not be eligible for return.

To request a return, sign in to your account and select the applicable order and items, and submit your request for review. Eligible unfulfilled items may also be submitted for cancellation within 1 hour of placing the order. Returns or cancellations are not considered approved until you receive confirmation from Apollo Lighting. Please do not ship or drop off merchandise before receiving return approval and instructions.

Customers are responsible for arranging and paying for return shipping unless the return is due to an error by Apollo Lighting or the item is verified as defective, damaged, or incorrect. Missing, damaged, defective, or incorrect items must be reported within 2 business days of delivery, and photos or other documentation may be required for review. If the issue is verified, Apollo Lighting may provide or reimburse return shipping and issue a replacement or refund depending on the circumstances. International customers are responsible for return shipping, duties, taxes, customs charges, brokerage fees, and other costs associated with an international return.

After your return is received and inspected, approved refunds are issued to the original payment method and may take 5-7 business days to appear after processing. Original shipping and handling charges are nonrefundable, and the value of any included free items that are not returned may be deducted from the refund. Apollo Lighting does not charge a standard restocking fee on eligible returns. Returns that are incomplete, damaged, installed, used, altered, improperly packaged, or otherwise do not meet the eligibility requirements may be refused. We recommend using a trackable and appropriately insured shipping service for all customer-arranged returns.

For assistance, contact info@apollolighting.com or call +1 (954) 375-0100.

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Many products sold by Apollo Lighting include a manufacturer's warranty covering defects in materials or workmanship. Warranty terms vary by brand, product category, and model, so eligibility, coverage duration, exclusions, and available remedies are determined by the applicable manufacturer. We recommend reviewing the warranty information provided with your product before installation or use, especially for marine electronics, navigation equipment, lighting, electrical systems, pumps, safety equipment, and other specialized marine products.

If you need warranty service, the claim must follow the process established by the manufacturer, authorized service center, or designated warranty provider. You may be asked for proof of purchase, a serial number, product registration, photos, maintenance or installation records, or other documentation. Apollo Lighting does not determine or modify a manufacturer's warranty coverage or final claim decision, but we are happy to help provide purchase information and direct you to the appropriate manufacturer or warranty resource.

Keep your receipt, product documentation, serial number information, and original packaging when practical. Damage caused by normal wear, misuse, improper installation, insufficient maintenance, corrosion, impact, unauthorized modifications, electrical issues, or operation outside the manufacturer's specifications may not be covered. Warranty claims are separate from standard returns, so a product that has been installed, used, or exposed to marine conditions may no longer qualify for return while still remaining eligible for evaluation under the manufacturer's applicable warranty.

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