1. Battery Charger
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CTEK MULTI US 25000 High-Capacity 12-Volt Battery Charger with Pulse Maintenance and Backup Power

CTEK MULTI US 25000 High-Capacity 12-Volt Battery Charger with Pulse Maintenance and Backup Power

Item # CTEK56674
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CTEK Power Inc Battery Charger - CTEK56674
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This powerful, 8-step charger uses a patented pulse-maintenance system to charge, maintain and help recondition 12V batteries. High-output capability can charge batteries quickly. Call 800-298-8924 to order CTEK Power Inc battery charger part number CTEK56674 or order online at etrailer.com. Free expert support on all CTEK Power Inc products. Guaranteed Lowest Price and Fastest Shipping for CTEK MULTI US 25000 High-Capacity 12-Volt Battery Charger with Pulse Maintenance and Backup Power. Battery Charger reviews from real customers.
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  • Reviews (74)
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CTEK Power Inc Battery Charger - CTEK56674

  • Battery Charger
  • Car/Truck/SUV
  • Boat
  • CTEK Power Inc
  • 12V
  • Wall Outlet to Vehicle Battery
  • AC to DC
  • Charges/Maintains
  • 500 Ah

This powerful, 8-step charger uses a patented pulse-maintenance system to charge, maintain and help recondition 12V batteries. High-output capability can charge batteries quickly.


Features:

  • 8-Step system constantly monitors and maintains 12V battery charge
    • Performs reliably and is virtually maintenance free
    • Works great for batteries that require fast charging, such as those found in RVs, boats and cars
      • Handles banks of batteries better than other chargers with lower amperage outputs
    • Won't overcharge or undercharge like typical trickle chargers
    • Switches automatically to pulse-maintenance phase after full charge has been reached
    • Reduces risk of overheating, sulfation and premature battery failure
  • Included temperature sensor adjusts charging voltage to battery temperature
  • 3 Charging modes
    • Normal: performs normal charge cycle
    • Supply: provides constant voltage
      • Maintains vehicle settings during battery changes
      • Provides constant power source
      • Keeps batteries constantly at 100-percent charge
    • Recond: recovers highly stratified batteries
  • Clamp-terminal cable temporarily attaches to battery terminals
  • Safe, versatile design
    • Approved for indoor and outdoor use
    • Prevents reverse-polarity mistakes
  • Includes charger, owner's manual and protective case


Specs:

  • Application: most starter and deep-cycle, 12V lead-acid batteries
    • Includes wet, MF, AGM and most gel batteries
    • Charges batteries with capacities from 50 Ah to 500 Ah
  • Charge cycle: 8-step, fully automatic charger with pulse maintenance, Reconditioning and Supply modes
  • Input voltage: 110V AC - 120V AC
  • Charging voltage:
    • Normal charge: 14.4V
    • Recondition mode: 15.7V
    • Supply mode: 13.6V
  • Charging current: 25A max
  • Dimensions: 9-1/4" long x 5-1/4" wide x 2-1/2" tall
  • 2-Year warranty


CTEK MULTI US 25000 bulk charging time chart

This CTEK charger comes with a battery temperature sensor and clamp-terminal cables for temporary connections.


battery temperature sensor and clamp-terminal cables for temporary connections

CTEK MULTI US 25000 Charging Process

A goof-proof design distinguishes CTEK's new-generation chargers from the competition - you don't have to be a mechanical guru to keep your battery working at top efficiency. CTEK's patented charging system monitors your battery, providing exactly the charge it needs during each unique charging stage. Superior and safe, this 8-step process (plus Supply Mode) uses switch-mode, pulse-maintenance technology.


CTEK US 25000 charging process chart

  1. Desulfation stage is the initial charging phase. This stage uses electronic pulses to desulfate batteries by converting lead sulfate crystals back to usable sulfuric acid.
  2. Soft-start stage tests the battery to see whether it can be charged. If the battery is unable to hold the initial charge, the unit goes into Error Mode, alerting you that your battery must be replaced.
  3. Bulk stage is the main charging phase. This stage accounts for 80 percent of the charging process and uses a constant charge level.
  4. Absorption stage completes the charge (to virtually 100 percent) using diminishing current to prevent battery damage.
  5. Analysis stage kicks in if the pre-set maximum time needed for absorption is exceeded. The unit measures the battery voltage and stops the charging process, automatically triggering an error indicator if the battery is faulty.
  6. Recond mode is used to recondition a battery that has been severely discharged. After the battery has been charged in Normal Mode and analysis has been completed, the charger reconditions the battery with a constant current of 1.5A and maximum voltage of 15.7V for up to 4 hours.
  7. Float-maintenance stage maintains a constant voltage of 13.6V during the first 10 days.
  8. Pulse-maintenance stage begins after the 10 days of float maintenance. During this stage, the charger maintains the battery at the optimum charge level of 95 percent to 100 percent. It recognizes any drop in voltage and sends a corresponding pulse of current to keep the battery properly charged. Pulse maintenance can be continued for months at a time.

Supply mode - included on this CTEK model - provides backup power to your vehicle while the battery is being changed. No more tiresome system resetting after battery changes.


Protects the User

Your personal safety is paramount, and CTEK's spark-free, short-circuit-proof design incorporates a feature that prevents reverse polarity, keeping you safe. You simply cannot make a polarity mistake: The charger will not operate if it is attached incorrectly. In addition, the red alarm light on the charger alerts you if there is a reverse-polarity problem.


Note: Anti-spark function is not active in Supply Mode.


Protects the Battery

CTEK's patented switch-mode, pulse-maintenance charging system is designed with the most up-to-date technology to safely charge your battery. Using carefully monitored, low-grid voltage, CTEK's patented process differs from competitors' chargers by providing the precise final voltage that your battery needs to maintain the optimum charge level. This sophisticated, interactive device will never overcharge or undercharge your battery. You can leave it attached to the battery for months, making it perfect for seasonal vehicle storage.


Won't Cause Overcharging or Overheating

Overcharging can cause gassing, which can lead to acid concentration and corrosion of the battery's lead plates. It can also cause the battery cells to dry out ("boil dry"), which can allow the battery to overheat and cause a fire.


Won't Cause Undercharging or Sulfation

Undercharging can be just as damaging to your battery as overcharging because chronic undercharging leads to sulfation. Sulfation occurs when the lead and lead dioxide of the battery's plates react with sulfuric battery acid to produce lead sulfate. This in turn is converted back to lead, lead oxide and sulfuric acid. A small, unavoidable amount of sulfation and gassing naturally takes place as a result of the chemical processes occurring in lead-acid batteries. However, extensive undercharging causes extra lead sulfate to accumulate on the lead plates of the battery. Because the crystalline form of the sulfate cannot hold an electrical charge, excessive sulfation greatly diminishes the charging ability of the battery, eventually rendering it unusable.


Provides Desulfation Using a Patented Process

Desulfation is the reversal of sulfation damage. The CTEK charger's unique process not only prevents the undercharging that produces excess sulfation, but it also includes a desulfating step that can often "revive" a lightly sulfated battery. It accomplishes this with carefully monitored electronic pulses of energy that help to break down the lead sulfate crystals, allowing the battery to accept a charge once again.


Ensures Consistent Charging with Low Ripple-Wave Percentage

Ripple-wave percentage is the quantity of disturbances exhibited in current and voltage. Even minor variations in household current can cause undercharging or overcharging, but CTEK's low-ripple design regulates the incoming current before passing it on to your battery, ensuring a consistent charge. This process can cause the charger to be a little slower than linear chargers but results in a healthier, more productive, longer-lasting battery.


Protects the Vehicle and Its Electronics

The charger is also safe for your vehicle. Its sophisticated circuitry is designed to be compatible with today's sensitive electronics and audio equipment. You can confidently charge your battery while it is still in the vehicle: no more hefting heavy batteries! CTEK's low ripple rate eliminates the danger of damaging electronic devices connected to the battery, and it prolongs the battery's service life. If you must replace your battery, the Supply Mode provides backup power to your vehicle's systems when you remove or replace the battery, sparing you the hassle of resetting your controls. Because the Recond (reconditioning) mode uses a higher voltage than other charging modes, using it may cause water loss in batteries and possibly shorten the life of your electronics. Check with vehicle manufacturer and battery supplier for information.


Keeps You Informed

Indicators on the face of the charger light up to show the charging stage.


Closeup of indicator panel of CTEK MUS 25000Descriptions of indicator panel of CTEK MUS 25000

Additional Specs

  • Current: 6.0A rms (at full charging current)
  • Back-current drain: less than 2 mAh per month
  • Ripple wave: less than 4 percent variance
  • Ambient temperature: -4 F to 122 F
    • Automatic reduction of power at increased ambient temperature
  • Insulation class: IP44


56-674 CTEK MULTI US 25000 High Output 12-V 8-Step Pulse-Maintenance Lead-Acid Battery Charger

Installation Details CTEK56674 Installation instructions




Customer Reviews

CTEK MULTI US 25000 High-Capacity 12-Volt Battery Charger with Pulse Maintenance and Backup Power - CTEK56674

Average Customer Rating:  4.9 out of 5 stars   (74 Customer Reviews)

This powerful, 8-step charger uses a patented pulse-maintenance system to charge, maintain and help recondition 12V batteries. High-output capability can charge batteries quickly.

- CTEK56674
by:

Thank you works GREAT 380259



- CTEK56674
by:

I only have good words about this company to share! They made my online shopping experience well worth , great products and amazing customer service if a product fails. They will take care of you right away. Thank you for top notch service Happy new year 734992



- CTEK56864
by:

Review from a similar MULTI in Battery Charger


Great performance in a light weight small package. Very sophisticated charging options to charge a wide variety of batteries in various temperature conditions. I trust this charger for my best quality batteries. 315287



- CTEK56864
by:

Review from a similar MULTI in Battery Charger


Purchased 2 CTEK battery chargers and maintainers. They arrived quickly, were well packed, and worked perfectly. Excellent product if you travel for long periods and don't want your batteries to go flat. Very pleased with my purchase and the service from etrailer. Thanks. 585816



- CTEK56158
by:

Review from a similar MULTI in Battery Charger


Good price, fast and friendly service. Items arrived on time and well packaged. I'm impressed that etrailer even sent a follow-up email to confirm my satisfaction. I have used the CTEK 3300 charger for over 5 years and it is outstanding. It has done a perfect job of charging/maintaining gel batteries on 3 vehicles and two tractors. Purchased two more to give family members as gifts. Thanks etrailer! 327189


Comments
Outstanding. Works perfect .... Same as day one.
Tom T - 12/23/2017

32223

- CTEK56158
by:

Review from a similar MULTI in Battery Charger


Using this on battery back sump pump system. Customer service was very helpful when I had questions on which model to order for the application. Thank you. 209839



- CTEK56158
by:

Review from a similar MULTI in Battery Charger


Great product and well made 682278



- CTEK56158
by:

Review from a similar MULTI in Battery Charger


Good price, quickly delivered, well presented on the web site, placing the order was easy, good email communication. Overall very pleased. 724863



- CTEK56158
by:

Review from a similar MULTI in Battery Charger


So far it looks great. Easy to set up and use. I'm using it to charge two 6 volt batteries hooked up in series. 328741



- CTEK56353
by:

Review from a similar MULTI in Battery Charger


Have not had the chance to use it but I like the advance technology. Better than the rest. 680218



- CTEK56158
by:

Review from a similar MULTI in Battery Charger


Ordered this item to go with the CTEK battery charger I also ordered. Now I don't have to pop open the hood to connect the CTEK charger to the battery. The items were shipped quickly even with the poor weather conditions we were enduring. I've always liked their price and assistance available for merchandise purchased thru etrailer. Kudos for the staff at etrailer.com. 326852



- CTEK56353
by:

Review from a similar MULTI in Battery Charger


I purchased this same unit about 10 years ago and have had good experience with it. It is still in good working order so when I developed the need for an additional unit I opted for the same mfg. My only concern is ordering from an authorized distributor in order to maintain the mfg warranty. Ordering from etrailer web site was a little confusing at the point of placing the order and I wasn’t sure if the order was actually submitted until I received a confirmation later that day. Delivery time was out the door same day. I would order from this distributor again in the future. 739546



- CTEK56353
by:

Review from a similar MULTI in Battery Charger


Excellent product, keeps my deep cycle battery up to charge. 183123


Comments
Still works great, no issues.
Mike N - 04/03/2016

17363

- CTEK56353
by:

Review from a similar MULTI in Battery Charger


I purchased a C Tek battery charger and it is much more advanced than the Battery Tenders that I have used for years. While the Battery Tenders do a good job of keeping a battery up, the C Tek can in some cases restore a battery that is sulphated. I like it as it is also a power supply if you want to change your battery and not loose the settings in your car. 568609



- CTEK56353
by:

Review from a similar MULTI in Battery Charger


This charger has worked flawlessly on a set of 4 golf cart batteries paired in series for a 12 volt system used on my RV. It is easy to operate and durable. Instructions are easy to understand. The easy clip exchange between battery clips vs. screw down rings makes it easy to switch over to other batteries, such as for my boat, for a quick charge. 674161



- CTEK56353
by:

Review from a similar MULTI in Battery Charger


We have used the C-Tek chargers for many years for vehicle prototype development, and it is the only brand and model that we use. Our normal supplier did not have this item in stock. I searched online for someone who could supply our needs as we were behind on a project. Etrailer had this item in stock. They offered great customer service and fast shipping. We ordered 4 chargers. We will start using Etrailer.com in the future for the C-Tek and other items. 479791


Comments
Great
Scott - 02/28/2019

49968

- CTEK56158
by:

Review from a similar MULTI in Battery Charger


Excellent battery maintenance device. I have used the CTEK system continuously for a year and avoided battery replacement on a vehicle that has typically killed batteries about every two years. The factory security system and electronics draw down the battery within 2 months, but the CTEK system maintains the battery above this draw down rate and keeps the battery topped off and cycles it to extend the life. I will be buying another two units for my other cars that spend the winters mostly unused. 754975



- CTEK56353
by:

Review from a similar MULTI in Battery Charger


Without a doubt the best charger I have ever owned. I use this charger on all three of my vehicles. Plus my motorcycle and garden tractor. Note: Just wish there was an accessory that allowed me to charge both batteries on my diesel truck at the same time. 730500



- CTEK56353
by:

Review from a similar MULTI in Battery Charger


Like that it has connections to charge various types of batteries. First use was a camper battery and it charged quickly. etrailer has always provided good service also. 715962



- CTEK56158
by:

Review from a similar MULTI in Battery Charger


Love this charger! Still in use on deep cycle battery after 11 months and works great! Best purchase I made for my RV 705595



- CTEK56158
by:

Review from a similar MULTI in Battery Charger


Have bought 3 of these to date Best charging solution I have ever owned Never worry about overcharging Was even able to give new life to a battery tested as dead / replace This battery is now still going after a year in ongoing service 667757



- CTEK56158
by:

Review from a similar MULTI in Battery Charger


These are great battery chargers I have had one for two years now with no problemo. I just purchased another one for my rv they are a must for a agm battery. 657215



- CTEK56353
by:

Review from a similar MULTI in Battery Charger


Great chargers. Seems like the plastic used in the proprietary connectors could be better quality. Otherwise doing a great job keeping batteries in good shape. 640056



- CTEK56158
by:

Review from a similar MULTI in Battery Charger


Too early to tell 614845



- CTEK56158
by:

Review from a similar MULTI in Battery Charger


I installed on my 2017 Polaris ranger, this charger keeps my battery at 100%. I keep it plugged in when not in use. Very easy to install, also on dash of the Polaris the plug snaps right in vacant spot and looks as if it came from factory that way. Very happy with charger! 607801


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    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate battery charger information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Edited by:
Frances L
Written by:
Raymond P
Expert Research:
Jameson C
Expert Research:
Adam R

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.


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