CTEK PRO25S Battery Charger - 50-60 Hz - 12V - 40-328

The CTEK PRO25S 12V Battery Charger (Part #40-328) is a professional-grade smart charger from one of the most trusted names in battery care technology. Designed for 12-volt battery systems and compatible with 50–60 Hz power supplies, the PRO25S is built for enthusiasts, shop professionals, and anyone who demands reliable, intelligent battery maintenance. Whether you're keeping a high-performance vehicle, fleet asset, or weekend cruiser in peak condition, the CTEK PRO25S represents the upper tier of what a CTEK battery charger can deliver.

Key Features & Benefits

• Professional CTEK Smart Charging Technology: CTEK has built its reputation on multi-step automatic charging programs that condition, charge, and maintain batteries without overcharging — protecting your investment for the long haul.
• 12V Compatibility: Engineered specifically for 12-volt battery systems, making it suitable for a wide range of passenger vehicles, performance cars, trucks, motorcycles, boats, and other powersport applications that run on 12V.
• 50–60 Hz Universal AC Input: The PRO25S operates on both 50 Hz and 60 Hz AC power, meaning it works with standard North American household current (60 Hz) and is also travel-compatible with international 50 Hz outlets.
• Trusted CTEK Brand Pedigree: CTEK is the same brand behind legendary chargers like the MXS 5.0 and the Multi US 7002, used by OEM manufacturers and professional workshops worldwide. The PRO25S carries that same DNA into a high-capacity platform.
• Automatic & Safe Operation: Like all CTEK smart chargers, the PRO25S is designed to be spark-free and reverse-polarity protected, so connecting it is straightforward and low-risk — even for first-time users.
• Maintains Battery Health: Beyond just charging, CTEK's smart chargers are known for their ability to recondition and maintain batteries, reducing the likelihood of premature battery failure — a key reason automotive enthusiasts choose a CTEK trickle charger or smart charger over a basic unit.

Specifications

• Brand: CTEK
• Model: PRO25S
• Part Number (MPN): 40-328
• SKU: CTEK40-328
• Voltage: 12V
• AC Input Frequency: 50–60 Hz
• Price: $443.99

Fitment

The CTEK PRO25S is a universal 12V battery charger and is not vehicle-specific in the traditional sense. It is compatible with any application that uses a 12-volt battery system, including but not limited to:

• Passenger cars and daily drivers
• Performance and enthusiast vehicles
• Trucks and SUVs
• Motorcycles and powersport vehicles
• Marine and boat batteries
• Classic and collector cars in long-term storage
• Fleet vehicles requiring consistent maintenance charging

This charger is not intended for 6V battery systems or 24V commercial/heavy-duty truck systems. Always verify your battery's voltage before connecting any charger.

Why Buy from ThreePiece.us

At ThreePiece.us, we make it easy to get the right gear with confidence. Every order ships free — no minimums, no surprises. Need to spread out the cost of a premium charger like the CTEK PRO25S? We offer financing through Affirm, so you can get the professional-grade equipment you need today and pay over time. Have questions about whether this charger is right for your application or battery type? Our team is here to help — reach out before you order and we'll point you in the right direction.

Frequently Asked Questions

Is the CTEK PRO25S the same as the CTEK MXS 5.0?

No. The PRO25S (40-328) is a distinct, higher-tier model in the CTEK lineup. The MXS 5.0 is a popular entry-level to mid-range smart charger, while the PRO25S is positioned as a professional-grade unit. Both are 12V CTEK smart chargers, but they differ in output capacity and intended use case — the PRO25S is aimed at higher-demand charging applications.

Will this charger work with my standard North American wall outlet?

Yes. The PRO25S supports 50–60 Hz AC input, which means it is fully compatible with standard 120V/60 Hz North American household outlets, as well as 50 Hz outlets found in many international locations.

Is this charger safe to leave connected for long-term battery maintenance?

CTEK smart chargers are well known in the automotive community for their ability to automatically switch into a maintenance/float mode once a battery is fully charged, preventing overcharging. The PRO25S follows CTEK's intelligent charging approach, making it appropriate for extended connection during vehicle storage — but always refer to the included documentation for specific guidance on your battery type.

Does the CTEK PRO25S come with any accessories or clamps?

We do not have verified manufacturer documentation to confirm exactly what is included in the box for this specific model. We recommend contacting our team at ThreePiece.us prior to purchase if what's included is important to your buying decision — we're happy to confirm current package contents.