Product Specifications for Dual Pro RS4 RealPRO Series 4-Bank Waterproof Battery Charger
| BM Part #: | ACC-RS-4 |
|---|---|
| Voltage: | 12 Volt |
| Charging Rate: | 24 Amp (6 Amp per Bank) |
| Length: | 10.25" |
| Width: | 6.5" |
| Height: | 3" |
| Shipping Weight: | 16.00Lbs |
| Warranty: | 2 Year Factory Direct |
- This item is not eligible for free shipping.
- Four Independent 6-Amp Banks: Charges up to four 12V batteries simultaneously — each on its own dedicated circuit — for 24 amps of total output with no cross-bank interference.
- Longer Cables for Larger Installations: Comes with 6-foot DC charge cables per bank and a 6-foot AC power cord — giving you more reach than the RS1, RS2, or RS3 for complex or spread-out battery setups.
- Compatible with Flooded, AGM, and Most Lithium Batteries: No manual switching required, with an automatic lithium wake-up function and low 2-volt detection to recover deeply discharged batteries.*
- *Always verify lithium battery compatibility with PRO Charging Systems (PCS) before use.
- Fully Waterproof for Fresh and Salt Water: Rugged, vibration-resistant construction with integrated mounting flanges for clean, permanent installation on board.
- Automatic Multi-Stage Charging with Float Maintenance: Charges each bank fully, then holds all four batteries at peak charge long-term — no timers, no check-ins, no overcharging.
- Marine-Grade Safety Certifications: Meets ISO 8846 Marine standards and US Coast Guard ignition protection requirements (33 CFR 183.410), with reverse polarity protection included.
Product Description
Larger boats and more complex battery setups demand more from a charger. If you're managing four batteries — a starting battery, a house battery, and two trolling motor batteries, for example — the Dual Pro RS4 RealPRO Series handles all of them at once, automatically, without any manual input required.
The RS4 is the top of the RealPRO line, delivering 24 amps of total output across four fully independent 6-amp banks. Each bank operates on its own dedicated circuit, so batteries of different ages, sizes, and charge levels can all be connected simultaneously without any one bank affecting the others.
Four Independent Banks, One Simple Plug-In
With four 12V outputs, the RS4 covers a wide range of battery configurations. You can charge four separate 12V batteries independently, run a 24V system on two banks while maintaining two additional 12V batteries on the remaining banks, or mix and match based on how your system is laid out. The RS4 supports 12V and 24V systems.
One practical upgrade over the rest of the RealPRO line: the RS4 comes with longer cables. Each DC charge cable runs 6 feet — a full foot longer than the RS1, RS2, and RS3 — and the AC power cord is also 6 feet. On a larger vessel where battery banks may be spread across more distance, that extra reach makes installation noticeably cleaner.
Compatible with Flooded, AGM, and Most Lithium Batteries
The RS4 works with wet cell (flooded), AGM, and most lithium batteries with no manual switching between types. For lithium batteries, an automatic wake-up function safely brings deeply discharged packs back to a chargeable state. Low 2-volt detection means the RS4 can recognize and begin charging a battery that has dropped as low as 2 volts — well below the cutoff point for most basic chargers.
Once each battery is fully charged, the RS4 automatically transitions to float maintenance mode, holding all four banks at peak charge without overcharging. The LED indicators provide an at-a-glance status for each bank independently, so you always know exactly where every battery stands.
Note: Always confirm lithium battery compatibility with PRO Charging Systems (PCS) before use.
Waterproof, Rugged, and Built to Stay On Board
Like every charger in the RealPRO line, the RS4 is fully waterproof and engineered for use in both fresh and salt water environments. The housing is rugged and vibration-resistant, and integrated mounting flanges make permanent installation straightforward. At 3.3 inches tall and 6.5 pounds, it's substantial enough to handle heavy-duty use while still fitting neatly in most bilge or console spaces.
Certified for Marine Use
The RS4 meets ISO 8846 Marine standards and is ignition protected per US Coast Guard regulations (33 CFR 183.410), making it safe for installation in enclosed spaces where fuel vapors may be present. Reverse polarity protection guards against accidental backwards connections, and the charger is FCC Part 15 Class A and B compliant.
The RS4 is manufactured to PRO Charging Systems specifications and carries a two-year manufacturer's warranty.
Tech Tip: Using A Multi-Bank Charger
Each bank of this charger is 6 amps. Combined, this is an output of 24 amps (4 independent banks of 6 amps each). This is commonly used in two ways:
- Connect each bank to separate battery systems, charging both by 6 amps each.
- Connect both amps to the same battery system, charging it by 24 amps total.
Frequently Asked Questions
What battery types is the RS4 compatible with?
The RS4 works with wet cell (flooded), AGM, and most lithium 12V batteries — with no manual mode switching required. An automatic wake-up function helps safely recover lithium batteries that have been deeply discharged. Always confirm lithium compatibility with PRO Charging Systems (PCS) before connecting.
What voltage systems can the RS4 support?
The RS4 is designed for 12V and 24V systems. Each bank provides an independent 12V output, which means you can charge up to four separate 12V batteries, or use two banks together to support a 24V system while the remaining banks handle additional 12V batteries.
How are the RS4's cables different from the other RealPRO models?
The RS4 comes with 6-foot DC charge cables (one per bank) and a 6-foot AC power cord. The RS1, RS2, and RS3 come with 5-foot DC cables and a 3-foot AC cord. The extra length on the RS4 is a practical advantage on larger vessels where battery banks may be farther apart or harder to reach.
Can I connect batteries in different conditions to the RS4 at the same time?
Yes. Because each bank operates independently on its own microprocessor, the RS4 charges each battery according to its individual needs. Batteries of different ages, sizes, or charge levels can all be connected simultaneously without any one affecting how the others are charged.
Is it safe to leave the RS4 plugged in long-term?
Yes. After each bank reaches a full charge, the RS4 automatically switches to float maintenance mode, keeping all four batteries topped off without overcharging them. It's well-suited for continuous connection during storage or between uses.
What warranty does the RS4 carry?
The RS4 comes with a two-year manufacturer's warranty from PRO Charging Systems (PCS), covering defects in materials and workmanship from the date of original retail purchase.
