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CTEK (56-864) MUS4.3 12 Volt Fully Automatic 8 Step Battery Charger,Black

4.6 4.6 out of 5 stars 1,085 ratings

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CTEK 4.3 (56-864)
Brand CTEK
Color Black
Item Weight 3 Pounds
Input Voltage 12 Volts

About this item

  • Fully automatic charging and maintenance in 8 steps maximizes battery life and performance
  • Water and dust resistant means it is safe to use in all climate situations
  • No sparks, short-circuit proof and reverse polarity protected makes it safe for all the vehicles electronics and easy to use
  • Patented maintenance charge for a unique combination of maximized life and performance
  • Numerous accessories simplifies using the same charger for multiple battery applications
See more product details

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This Item
CTEK (56-864) MUS4.3 12 Volt Fully Automatic 8 Step Battery Charger,Black
CTEK (56-864) MUS4.3 12 Volt Fully Automatic 8 Step Battery Charger,Black
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PriceCurrently unavailable.$176.74$10.80-20% $99.95
List:$124.95
-22% $69.95
List:$89.95
-23% $49.95
List:$64.95
Delivery
Get it Apr 3 - 5
Get it Apr 3 - 8
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Customer Ratings
Easy to use
4.9
4.4
4.6
4.6
Value for money
4.7
4.3
4.4
4.3
Sold By
GM Parts Authority
Adorama
Amazon.com
Amazon.com
Amazon.com
input voltage
12 volts
240 volts
120 volts
120 volts
120 volts
battery charge time
10 hours
10 hours
10 hours
weight
3 pounds
1.75 pounds
0.3 pounds
3.99 pounds
1.59 pounds
1.23 pounds

Product Description

The CTEK MUS 4.3 battery charger is perfect for those with high demands and can solve a broad range of battery-related problems. It offers state of the art technology that was previously only found in CTEK’s professional products and features 8 patented steps to maximize battery life and performance. A few of the key features are a patented de-sulphation process which removes sulfate from the lead plates, a battery diagnosis that shows if a battery can receive and retain a charge, a special reconditioning function that restores stratified and deeply discharged batteries, unique maintenance charging, a mode for optimized charging during cold winter days and the charging of demanding AGM batteries (i.e. Optima). The unique LED display allows the user to follow the entire charging process.

The MUS 4.3 is a non-sparking, short-circuit proof, reverse polarity protected unit designed for untroubled usage and has built in overcharging protection. It is splash, dust and water-resistant so that the solution can be taken to the problem even if it rains or snows.

Included with the MUS 4.3 is the charging unit, a Comfort Connect clamp, a Comfort Connect M6 eyelet and a storage bag. With optional accessories, the charger can to used to charger all your battery needs with a simple quick plug-in, saving time and frustrations especially for those applications that have hard to access batteries.

The MUS 4.3 battery charger has a 5 year Limited warranty

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
For warranty information about this product, please click here [PDF ]

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CTEK

CTEK (56-864) MUS4.3 12 Volt Fully Automatic 8 Step Battery Charger,Black


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What's in the box

  • INTERIOR ACCESSORY
  • Product guides and documents

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    Customer reviews

    4.6 out of 5 stars
    4.6 out of 5
    1,085 global ratings

    Customers say

    Customers like the quality, ease of use, and compactness of the battery charger. For example, they mention it works perfectly to keep the battery fresh, and is easy to set up. Some appreciate the connectivity, and reconditioning. That said, opinions are mixed on heat, lighting, and cord length.

    AI-generated from the text of customer reviews

    617 customers mention558 positive59 negative

    Customers are satisfied with the quality of the battery charger. They mention that it works perfectly to keep the battery fresh, and has never had any issues with their battery. It's a high-end battery maintainer, and does an excellent job on keeping the battery topped off. Some say that it's great for reviving near-dead batteries and maintaining a battery in your vehicle. Overall, most are happy with their purchase and recommend it to others.

    "...I only drive like once a month and this does an excellent job on keeping the battery topped off and the car starts every time...." Read more

    "...Its heavier in contraction (seems more durable), display/lights are easy to view, it's simple to use, and it comes with a FULL 5 year warranty!..." Read more

    "...After setting up the mode, the charger is fully automatic and has operated flawlessly for me...." Read more

    "...It will also attempt to recover batteries from low voltages that would usually require a "dumb" charger to start with a Ctek or Xtreme..." Read more

    114 customers mention109 positive5 negative

    Customers find the battery charger easy to use. They mention it's simple to set up, and has accessories that make the job more convenient. Customers also appreciate the clear indication of the charging voltages for each program. They say it'll make it easier to use as a maintainer, and the instructions give a clear indication. Customers love the simplicity, the size, weight, packing, and 8-stage, truly automatic operation.

    "...do that by buying the cigarette lighter adapter, it makes it super easy to use...." Read more

    "...(seems more durable), display/lights are easy to view, it's simple to use, and it comes with a FULL 5 year warranty!..." Read more

    "...The instructions are easy, the charger is easy to use and set up...." Read more

    "...out of the unit and it does come with a nice bag with a up step-by-step instructions on the back of the bag...." Read more

    48 customers mention48 positive0 negative

    Customers appreciate the compact size of the battery charger. They say it has flawless performance, is smaller than other battery chargers, and fits perfectly in the engine compartment. Customers also like the ability to choose between small and larger batteries, as well as a cold weather setting.

    "...What I like about it: + small size + no need to worry about weather proof of the unit () + do what its suppose to do to keep car..." Read more

    "...(this was due to how small it is, it fits perfectly in side the engine compartment and we run the cord down by the radiator to plug in to house..." Read more

    "...It's surprisingly small and well built for what it can do. Can't praise it enough, especially considering the price...." Read more

    "...It's very small and comes in a drawstring bag you can keep in the trunk...." Read more

    18 customers mention18 positive0 negative

    Customers are satisfied with the connectivity of the battery charger. They mention that it comes with required connections, hard wire connections, and clamps. They also appreciate the provided accessory battery connections with quick connectors. Customers also like the included jumper cables that plug onto the onboard input. They appreciate the ring terminal connection pigtail and an alligator clamp pig tail.

    "...It comes with a extremely simple hard wiring kit that has just a little adapter that sticks out underneath the carpet and maybe 3 times a week all..." Read more

    "...Especially like that the chargers come with a ring terminal connection pigtail, and an alligator clamp pigtail, with a nice quick disconnect in the..." Read more

    "Well, this thing is just the sh&7. It came with all the wiring to use this with all three of my BMWs..." Read more

    "...The product comes with two interchangeable cables for connecting to the battery, a bag for storage, instructions (not overly useful), but NO..." Read more

    18 customers mention18 positive0 negative

    Customers are satisfied with the reconditioning function of the battery charger. They mention that it's good to have for bringing older batteries back to life, and the best feature is the'recondition' setting. The re-conditioning mode revitalizes old batteries, and works wonders on batteries that sit for long periods of time. The unit is easy to use and does a great job of re conditioning.

    "...Status lights mean something. Reset is automatic after a power outage. Highly recommend product." Read more

    "...Namely that this charger doesn't auto-shutoff after 48 hours (which is what the Noco G3500 does) and if there's a power cycle through a fault in the..." Read more

    "...The recondition mode works wonders on batteries that sit for long...." Read more

    "...Really like the recondition mode. Its helped my battery's improve for sure. Its a good buy. Thanks Amazon!" Read more

    41 customers mention17 positive24 negative

    Customers are mixed about the heat of the battery charger. Some mention that it maintains without getting hot, while others say that it gets hotter than heck and the bottom of the unit can get warm.

    "...The unit also gets Extremely Hot almost hot to the touch when charging, because of this unit got so hot I decided to put the unit on my work bench..." Read more

    "...It does add an 8 amp charge capability and temperature compensation...." Read more

    "...It does get warm, almost uncomfortable to handle and pulls about 75 watts from the wall at it's peak...." Read more

    "...The charger does get warm, however it is not too hot to the touch and not more than I would expect...." Read more

    22 customers mention15 positive7 negative

    Customers are mixed about the lighting of the battery charger. Some mention that the indicator lights are very helpful and love the status lights to let them know what stage it's currently in. They also appreciate the LEDs that give a clear indication of what the charger is doing. However, others say that the flashing power light is not helpful and can give away the reverse polarity.

    "...Status lights mean something. Reset is automatic after a power outage. Highly recommend product." Read more

    "...I like the fact that they have in-line fuse’s. Lights are very bright on the unit and the selection mode is responsive when making your..." Read more

    "...Both terminals with the comfort connectors. they do NOT have the battery level indicator lights of the after-market connectors sold here...." Read more

    "...The LEDs give a clear indication of what the charger is doing (Bulk, Absorption, Float, etc)...." Read more

    15 customers mention8 positive7 negative

    Customers are mixed about the cord length. Some mention that the cord easily fits in their closed Porsche door without pinching, while others say that it's rather short.

    "...If fits right cleanly and snugly under the main seat...." Read more

    "...what I don't like about it: - the wire (battery side) is a little short. I wished that they had put a longer wire there" Read more

    "...wire directly to your battery for reliable connections - no battery clips to fall off. (though it also has clips)..." Read more

    "...o The indicators are hard to see in sunlight.o The AC cord is overkill...." Read more

    Another powerful tool for recovering abused batteries.  Not a panacea though.
    4 Stars
    Another powerful tool for recovering abused batteries. Not a panacea though.
    Update, January 2017;I've since discovered and purchased the BatteryMinder 128CEC1, and it is close to my ideal smart charger, as it combines a full-time desulfation with multiple voltage profiles for gel, flooded, and high-performance AGM specific batteries, almost combining all of the functionality of the Ctek and XtremeCharge. The one thing it misses is the recondition charge function of the Ctek. It does add an 8 amp charge capability and temperature compensation. It will also attempt to recover batteries from low voltages that would usually require a "dumb" charger to start with a Ctek or Xtreme Charge. If I were to only have one charger, the 128CEC1 would be my choice. It does come at a price though, as you could almost buy a Ctek and an Xtreme Charge for the same price. You'd be missing the temperature compensation though, which I feel is important if you are charging batteries in less than ideal temperature conditions..Original review;I have an old Schumacher battery maintainer, a Yuasa SmartStart 1.5, a Pulsetech Xtreme, and the CTEK MUS 4.3.The Schumacher is just a maintainer/charger. It has no desulphate mode, but works well to keep the battery topped up.The Yuasa does the same thing, but adds a mediocre desulphate mode. In testing, I found that it did bring batteries to a higher state of charge then the Schumacher.The Xtreme Charge is a powerful tool for desulphating batteries, but it does not do as well as the MUS 4.3 at fully charging a good battery.The MUS 4.3 has a desulphate mode, but I've never seen it enter that mode, even on a badly abused battery.I'm currently in the process of attempting to restore a 12V 22 Anp-hour 5 year old AGM battery that was deeply discharged, to under 6v. The Schumacher, Yuasa, and Xtreme all refused to even start on this battery. I had given up on it, and was about to order a replacement, when I decided to try out the MUS 4.3.When I plugged in the MUS 4.3, it attempted to charge the battery, but then found the battery bad after it dropped to under 12v in 3 minutes, after it attempted to charge the battery. I feel that afew attempts to recharge the battery would probably have done the trick, but it was bed-time, so I figured I'd go back to ol-reliable Xtreme Charge.I then hooked up the Xtreme Charge, and it began to charge the battery. After letting it sit overnight on the battery, the battery was able to hold over 12V. I decided to leave it on the Xtreme charge another 12 hours, and will attempt a recondition with the CTEK.I will update later on my progress, but my conclusion so far, is that the CTEK offers features the Xtreme Charge does not have, while the Xtreme Charge offers features the CTEK does not have. Both are top of class chargers. I wish I could somehow combine them into one. If the CTEK would always desulphate, like the Xtreme charge does, I'd pick it over the Xtreme. As is, I'd lean more toward the Xtreme. For cases where it does not want to start charging to to low voltage, one can use a $10 trickle charger to bring the battery up over 11 volts. My trickle charger died though, and I have yet to replace it.Update:After leaving the battery that the CTEK said was bad, on the XTreme charge for a week, it now is working well. The Xtreme Charge would not charge the battery before I tried the CTEK on it though.At this point, if I had to have one battery maintainer, I'd stick with an Xtreme Charge and get a $10 trickle charger for truly dead batteries, to get them up to where the Xtreme Charge will charge them.That said, I'm happy to have the CTEK, in addition to the Xtreme Charge as the different modes the CTEK has can come in handy.Update 2:I have a car with a year old battery that stopped accepting a charge. This car sits a lot, but is kept on one of my battery maintainers when it is sitting for long periods.After several months of driving it every day, it stopped accepting a full charge. It got to the point where I was keeping it on the Xtreme charge at night, but it still would barely start the car at the end of the day. I checked the alternator and it was fine. I was almost ready to buy a new battery when I decided to give the CTEK a try.I set the CTEK to recondition mode, and it spent several hours charging the battery. The next morning, the engine fired up with gusto. That evening, after sitting at work all day, it fired up with gusto again, and the next morning and evening as well.The CTEK just paid for itself once more. At this point, I feel like both chargers, the CTEK, and the Xtreme, definitely have there own niches. I am glad I have both.Update 3;I wound up leaving the lights on for my Suzuki Samurai, which has a 4 year old battery. I did not drive it for two months, so the battery was stone dead for that time.Neither the XtremeCharge nor the CTEK will charge a completely dead battery, so I hit it with my old Schumacher first. The Schumacher instantly showed the battery fully charged, indicating that the battery had no capacity.After that, I tried the Xtreme Charge, but it said the battery was bad. I put the CTEK on the battery in recondition mode, and left it on for 12 hours. After that, the battery started the Samurai, but very slowly, indicating the battery still did not have much cranking capacity.Next I put it on the Xtreme Charge for 12 hours, and it never went above 75% charge, but the the engine fired up like new again.I did one more recondition with the CTEK, but have not had time to do another application with the Xtreme Charge so I don't know if it will take a 100% charge. I will update when I do get a chance, but I am very happy as of now since I did not have to buy a new battery.
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    Top reviews from the United States

    Reviewed in the United States on February 27, 2013
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    Reviewed in the United States on August 24, 2018
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    Reviewed in the United States on October 23, 2018
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    Top reviews from other countries

    Amazon Customer
    5.0 out of 5 stars and works like a charm
    Reviewed in Canada on June 4, 2018
    Style: CTEK 4.3 (56-864)Verified Purchase
    Chris
    5.0 out of 5 stars Great Charger especially for these sub artic temperatures.
    Reviewed in Canada on January 27, 2015
    Style: CTEK 4.3 (56-864)Verified Purchase
    2 people found this helpful
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    Andrew C.
    5.0 out of 5 stars I don't drive my car a lot in winter and am happy that I can plug it in to keep the ...
    Reviewed in Canada on January 15, 2017
    Style: CTEK 4.3 (56-864)Verified Purchase
    One person found this helpful
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    Amazon Customer
    4.0 out of 5 stars good little charger
    Reviewed in Canada on August 23, 2017
    Style: CTEK 4.3 (56-864)Verified Purchase
    Amazon Customer
    5.0 out of 5 stars Good quality, well built 4
    Reviewed in Canada on July 23, 2016
    Style: CTEK 4.3 (56-864)Verified Purchase
    Customer image
    Amazon Customer
    5.0 out of 5 stars Good quality, well built 4
    Reviewed in Canada on July 23, 2016
    Good quality, well built 4.3 amp automatic battery charger and tender. I have 4 vehicles with both deep cycle AGM and motorcycle batteries.
    Good to simply select and connect this charger once a month to top up state of charge. Your batteries will then last longer.
    Comes with regular battery clamps as well as a vehicle mounted quick disconnect, for when you frequently charge a specific vehicle.
    Takes about 4-5 hours to get your battery fully charged and a green light at # 7 on scale.
    The snowflake symbol is for AGM type batteries and cold weather maintenance, the tested output voltage was 14.6v which is perfect.
    So I don't back up with a connected charger, I place a "Charger On" card on the driver seat.
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    4 people found this helpful
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