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Sold by: R/A Hoerr Incorporated
Sold by: R/A Hoerr Incorporated
(32739 ratings)
97% positive over last 12 months
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CTEK (56-958) MUS 4.3 POLAR 12 Volt Fully Automatic Extreme Climate 8 Step Battery Charger

4.7 4.7 out of 5 stars 613 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Battery Chargers by CTEK

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Battery Charger

Purchase options and add-ons

Brand CTEK
Color Orange
Product Dimensions 6"D x 11"W x 2.5"H
Item Weight 1.94 Pounds
Input Voltage 12 Volts

About this item

  • Specially developed for use in extreme cold conditions featuring AC and DC cables adapted to handle severe cold temperatures
  • Fully automatic 8 step patented program tests battery condition and revives, charges and maintains to ensure maximum battery life and performance
  • No sparks, short-circuit proof and reverse polarity protected makes it safe for all the vehicles electronics and easy to use
  • Water and dust resistant means it is safe to use in all climate situations
  • Numerous accessories simplifies using the same charger for multiple battery applications
Serve a springtime stunner
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$109.99
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$14.99 ($1.83/Foot)
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CTEK (56-958) MUS 4.3 POLAR 12 Volt Fully Automatic Extreme Climate 8 Step Battery Charger
CTEK (56-958) MUS 4.3 POLAR 12 Volt Fully Automatic Extreme Climate 8 Step Battery Charger
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Price-21% $109.99
List:$139.45
$116.98$29.55-20% $99.95
List:$124.95
-22% $69.95
List:$89.95
-23% $49.94
List:$64.95
Delivery
Get it as soon as Monday, Mar 25
Get it as soon as Friday, Mar 22
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Customer Ratings
Easy to use
4.8
5.0
4.4
4.6
4.6
Value for money
4.5
5.0
4.3
4.4
4.3
Safety Features
4.7
5.0
4.4
Longevity
4.5
4.1
4.1
Sold By
R/A Hoerr Incorporated
R/A Hoerr Incorporated
Blue Grass Wholesale
Amazon.com
Amazon.com
Amazon.com
input voltage
12 volts
5 volts
240 volts
120 volts
120 volts
120 volts
battery charge time
10 hours
10 hours
10 hours
specification met
reach
CE
UL, CEC, FCC
UL, CEC, FCC
weight
1.94 pounds
3.99 pounds
1.59 pounds
1.23 pounds

From the manufacturer

Extreme temperature charging

CTEK MUS 4.3 POLAR

Extreme temperature charging

CTEK’s MUS 4.3 POLAR battery charger and maintainer has been specially developed for use in extreme cold conditions. It features Nordic standard cables adapted for use in low temperatures and orange casing for high visibility. It’s the ideal charger for cold weather vehicles such as snowmobiles and it will charge over a wide range of temperatures right down to -22°F (-30°C). The MUS 4.3 POLAR uses CTEK’s unique, patented system to recover, charge and maintain all types of lead-acid battery to maximize performance and extend battery life.

Polar in use

Safe and simple for winter performance

‘Snowflake’ and Reconditioning Modes

The MUS 4.3 POLAR’s special ‘Snowflake’ mode gives you a faster charge in extreme cold temperatures, as well as charging AGM batteries. The dedicated ‘RECOND’ reconditioning program restores battery life and reconditions dead batteries.

Patented Desulphation Function

Unused batteries lose their power and their life can be shortened through sulphation. The MUS 4.3 POLAR analyzes the state of the battery and, if possible, recovers the battery and its health.

Safe Operation

The MUS 4.3 POLAR has non sparking, reverse polarity protected clamps. It’s short circuit proof with clean voltage and current delivery to ensure there are no surges or spikes.

  • ‘Snowflake’ mode for extreme conditions down to -22°F (-30°C)
  • ‘RECOND’ mode to restore stratified and deeply discharged batteries
  • Patented desulphation function
  • Splash proof, dustproof and short circuit proof
  • Nordic standard cables with non-sparking, reverse polarity protected clamps
  • Simple plug and play operation –­­ select the program and mode and leave the charger to do the rest
  • Fully automatic 8-step charging
  • Works with all 12V lead-acid batteries
Polar one tool

All round charging in cold weather

  • Small and normal battery modes
  • ‘Snowflake’ mode for cold weather charging and AGM batteries
  • ‘RECOND’ mode to restore deeply discharged or dead batteries

Accessories Available to Take Your Chargers to the Next Level (Sold Separately)

Comfort Connect Indicator Eyelet

CTEK Bumper

Extension Cord

CTEK Comfort Connect Cig Plug (56-263)

CTEK COMFORT CONNECT INDICATOR EYELET (56-629)

Comfort Indicator Eyelet is designed for permanent installation with a direct connection to the battery. For use with CTEK chargers, it enables you to charge batteries that are in hard to reach places or where using clamps is inconvenient or impossible. Extended cable length 19.6 inches.

CTEK BUMPER (56-915)

The CTEK Bumper is a silicon rubber case to protect both the CTEK MUS 4.3 POLAR battery charger as well as your vehicle's paintwork from being damaged by hitting hard surfaces or your vehicle.

CTEK COMFORT CONNECT EXTENSION CABLE (56-304)

Give yourself more length for ease-of-charging.

The CTEK Comfort Connect Extension Cable extends the reach of your CTEK MUS 4.3 POLAR battery charger with additional cable length of 8.2 ft.

CTEK Comfort Connect Cig Plug (56-263)

CTEK Comfort Connect Cig-Plug enables charging the battery through a cigarette lighter outlet. It eliminates any hassle; simply charge from within the car, works perfectly with CTEK’s battery chargers. Note: The socket in the vehicle must be live when the ignition is in the “off” position to charge your battery using this accessory.

CTEK MUS 4.3 POLAR Technical Specifications

Input voltage AC 100-120VAC, 50-60Hz
Charge Voltage 14.4 / 15.0 / 15.8 V
Minimum battery voltage req: 2.0V
Charge Current Max 4.3 A
Type of Charger 8 step, fully automatic charging cycle
Type of Battery 12V lead-acid batteries (Wet, MF, AGM, GEL)
Battery Capacity 1.2-110 Ah, up to 160 Ah for maintenance

From the brand

Product information

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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CTEK (56-958) MUS 4.3 POLAR 12 Volt Fully Automatic Extreme Climate 8 Step Battery Charger


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Product guides and documents

What's in the box

  • INTERIOR ACCESSORY
  • Product Description

    The MUS 4.3 POLAR charger has been specifically developed to offer excellent all around charging. The special cold weather performance and adapted AC and DC cables handle severe cold down to -22 degrees F (-30 degrees C). It is an advanced microprocessor controlled battery charger providing unrivalled performance on batteries from 1.2Ah to 110Ah.

    The MUS 4.3 POLAR charger is loaded with features including diagnosis of battery condition to establish if it can receive and retain a charge, patented automatic de-sulphation program and a special reconditioning function that will revive and restore deeply discharged and stratified batteries. The 'Snowflake' mode ensures ideal charging performance when in the most extreme cold conditions. The patented Float/Pulse maintenance makes the charger ideal for long-term maintenance. The entire process of battery testing, charging and maintenance is easily followed on the clear LED display.

    The charger is a fully automatic (connect and forget) 12V charger with 8 charging steps. The RECOND and SNOWFLAKE modes operate individually or together in both 0.8A and 4.3A programs, providing great flexibility for the user. It offers a wide charging range on all lead-acid battery types from 1.2Ah up to 110Ah, with additional maintenance capability to 160Ah.

    This charger is splash and dust proof and above all, very easy to use. It also has safety features to prevent sparks and protect against reverse polarity and short circuiting ensuring that you and your vehicles electronics are kept safe.

    The MUS POLAR 4.3 battery charger has a 5 year Limited warranty

    Customer reviews

    4.7 out of 5 stars
    4.7 out of 5
    613 global ratings

    Customers say

    Customers like the performance, quality and ease of use of the battery charger. For example, they mention that it works well, is reliable and easy to set up. Some appreciate the cold weather flexibility and the waterproof design. That said, opinions are mixed on the battery capacity.

    AI-generated from the text of customer reviews

    46 customers mention42 positive4 negative

    Customers are satisfied with the performance of the battery charger. They mention that it works well, is easy to operate, and is pleased with the function and quality of the product. Some say that the charger works well on other batteries and has no problems charging them. Some customers also mention that the cords still work great in even subzero garage temperatures.

    "...I’m happy it as it’s been in use for 1 month, no issues. I look forward to many years of added battery life on the imported German car" Read more

    "...It works great!" Read more

    "Works great" Read more

    "...And it works well....BUY WITH CONFIDENCE." Read more

    46 customers mention43 positive3 negative

    Customers are satisfied with the quality of the battery charger. They mention that it is the best battery charger they have had, reliable, and outstanding. Some say that it's a smart charger and their car always starts up robustly after being on the device.

    "I use for a car left at beach house. Battery is always charged enough to start with no problems even after long absence" Read more

    "Quality product that is extremely rugged in adverse weather conditions. User friendly and easy to use with excellent instruction manual." Read more

    "...BUT THIS IS AN OUTSTANDING charger/maintainer, requiring very little power after it automatically switches to maintenance mode...." Read more

    "Best battery charger I’ve had yet and I have had quite a few. This one I feel I can trust not to overcharge my battery...." Read more

    22 customers mention22 positive0 negative

    Customers find the battery charger simple, easy to set up, and straight forward. They also appreciate the excellent instruction manual.

    "Really liking this product so far. Easy to set up and it tells you how your battery is doing." Read more

    "...If you have the same problem, this is definitely a solution. Easy to use too." Read more

    "...User friendly and easy to use with excellent instruction manual." Read more

    "...them compare in size, ability to mount to chasis, and just plain easy to install as this one...." Read more

    9 customers mention7 positive2 negative

    Customers like the coldness of the battery charger. For example, they say it's great in the coldest weather, has good cold weather flexibility, and is waterproof.

    "...120v input cable and main charger output cables do have good cold weather flexibility...." Read more

    "...Also, it is waterproof, which will be great in snow and ice.Update: Have been using this charger for a few years now...." Read more

    "I like the fact that the charger is rated as being able to operate in cold temperatures...." Read more

    "...Have to watch where you set the unit while in use as it can get rather hot, don’t set on anything plastic or painted...." Read more

    4 customers mention4 positive0 negative

    Customers are satisfied with the appearance of the battery charger. They mention that it looks cool, the color is eye catching, and the functions make it super flexible. Some appreciate the lights that tell what it is doing at the moment.

    "...Works great in even subzero garage Temps for me. Nice having the lights to tell what it is doing at the moment too. Jay Leno was right on this one." Read more

    "...The color is eye catching, the functions make it super flexible. I charged two of my vehicles the first day, the batteries act better than new." Read more

    "Not just looks cool also working great! If you don't drive your car very often then this is a must-have" Read more

    "...It's what semi-neglected winter batteries need. The color goes with anything. Tis the high 14.7 voltagemodel - for Odyssey type AGM batteries." Read more

    4 customers mention4 positive0 negative

    Customers like the cables of the battery charger. They say the cables stay flexible, and the functions make them super flexible. Some say that the cables are eye catching and stay flexible in very cold temps.

    "...The cold weather model does indeed have flexible cables which stay flexible - they feel like 8mm plug wires...." Read more

    "...The cables were still flexible and it ran my battery through the full cycle and is keeping it charged. Time will tell...." Read more

    "...The cord for this polar version stayed nice and flexible in very cold temps...." Read more

    "...The color is eye catching, the functions make it super flexible. I charged two of my vehicles the first day, the batteries act better than new." Read more

    4 customers mention4 positive0 negative

    Customers like the disconnect speed of the battery charger. They mention it's quick to disconnect and reconnect, and has quick connect terminals.

    "...The connection was fine and the battery is brand new from last month...." Read more

    "...Comes with quick connect terminals. Recommended it my car forum." Read more

    "...i really like the Quick disconnect which I have wired to the tractor." Read more

    "...used to keep a car charged outside in the winter time quick to disconnect and reconnect" Read more

    19 customers mention10 positive9 negative

    Customers are mixed about the battery capacity of the charger. Some mention that it maintains battery charge, extends battery life, and they can trust it not to overcharge their battery. Others say that it can be too dead for the charger to work, it stops charging before the battery is fully charged, and it turns off for no reason.

    "...Since installing I’ve not had any issues with the battery." Read more

    "I had another brand on my import car from Germany. It would turn off for no reason...." Read more

    "...three months of very cold, snowy weather and my car battery is happy and fully charged. YIPPPEEEE...." Read more

    "...As it turns out, the battery can be too dead for the charger to work. This battery was new as of August 2019...." Read more

    Great charger.
    5 Stars
    Great charger.
    I purchased the CTEK to add to my adventure van as it sometimes sits for weeks at a time. I unabashedly copied the set up of a fellow forum member (his picture of the CTEK) by adding the CTEK comfort indicator panel. Since installing I’ve not had any issues with the battery.
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    Top reviews from the United States

    Reviewed in the United States on December 1, 2023
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    Reviewed in the United States on November 7, 2023
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    5.0 out of 5 stars Great charger.
    Reviewed in the United States on November 7, 2023
    I purchased the CTEK to add to my adventure van as it sometimes sits for weeks at a time. I unabashedly copied the set up of a fellow forum member (his picture of the CTEK) by adding the CTEK comfort indicator panel. Since installing I’ve not had any issues with the battery.
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    Customer image
    One person found this helpful
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    Reviewed in the United States on January 27, 2024
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    Reviewed in the United States on December 22, 2023
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    Reviewed in the United States on March 10, 2023
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    Reviewed in the United States on February 2, 2024
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    Reviewed in the United States on November 5, 2023
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    Reviewed in the United States on March 16, 2020
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    Top reviews from other countries

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    David Gilbert
    5.0 out of 5 stars CTek Battery Charger
    Reviewed in Canada on January 23, 2024
    Style: Battery ChargerVerified Purchase
    Pedro
    5.0 out of 5 stars Cumple lo prometido !
    Reviewed in Mexico on January 4, 2020
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    Richard G
    5.0 out of 5 stars Simple to use, and does the job
    Reviewed in Canada on November 13, 2022
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    Manuel Ferrara
    4.0 out of 5 stars Llegó...
    Reviewed in Mexico on December 16, 2020
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    Amazon Customer
    5.0 out of 5 stars Life saver
    Reviewed in Canada on November 10, 2020
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    One person found this helpful
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