---
product_id: 280113323
title: "CTEK (56-958) MUS 4.3 POLAR 12 Volt Fully Automatic Extreme Climate 8 Step Battery Charger"
brand: "ctek"
price: "€ 469.07"
currency: EUR
in_stock: false
reviews_count: 5
url: https://www.desertcart.nl/products/280113323-ctek-56-958-mus-4-3-polar-12-volt-fully
store_origin: NL
region: Netherlands
---

# 8-step patented charging & maintenance program Operates down to -22°F (-30°C) extreme cold Reverse polarity, spark & short-circuit protection CTEK (56-958) MUS 4.3 POLAR 12 Volt Fully Automatic Extreme Climate 8 Step Battery Charger

**Brand:** ctek
**Price:** € 469.07
**Availability:** ❌ Out of Stock

## Summary

> ❄️⚡ Charge like a pro, even when the cold bites!

## Quick Answers

- **What is this?** CTEK (56-958) MUS 4.3 POLAR 12 Volt Fully Automatic Extreme Climate 8 Step Battery Charger by ctek
- **How much does it cost?** € 469.07 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/280113323-ctek-56-958-mus-4-3-polar-12-volt-fully)

## Best For

- ctek enthusiasts

## Why This Product

- Trusted ctek brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety First Design:** No sparks, reverse polarity, or short-circuit risks—protecting your vehicle’s electronics effortlessly.
- • **Smart 8-Step Charging:** Advanced microprocessor control tests, revives, and maintains batteries for peak power and longevity.
- • **All-Weather Durability:** Water and dust resistant for reliable use in any climate or environment.
- • **Polar-Ready Performance:** Engineered to thrive in brutal cold, ensuring your battery never quits when winter hits.
- • **Versatile & User-Friendly:** Multiple accessories and clear LED display make it perfect for a wide range of lead-acid batteries, from 1.2Ah to 110Ah (maintenance up to 160Ah).

## Overview

The CTEK MUS 4.3 POLAR is a fully automatic 12V battery charger designed for extreme cold climates down to -22°F (-30°C). Featuring an 8-step patented charging program, it diagnoses, revives, charges, and maintains lead-acid batteries from 1.2Ah to 110Ah with safety protections against sparks, reverse polarity, and short circuits. Its water and dust resistance plus versatile accessories make it the ultimate all-weather, all-battery solution for professionals and enthusiasts who demand reliable power in any condition.

## 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- 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

Review: CTEK MUS 4.3 Polar Extreme Climate is rated to -22° F ..and so far it hasn't been colder than that. The review is about the cold weather rating, and about the 8 stage charging feature. I wanted to have a battery maintainer to prevent the battery from freezing. It killed all the vehicles batteries last winter because the battery charger maintainer was actually only good to 32° F. The problem wasn't the amps. It was the temperature rating of the device. I would be satisfied however I noticed much better battery charger performance. The car doesn't just start, it starts with vigor. It continues to perform all day no matter how many short trips I have on a cold day. I wouldn't know how much more because it is on the charger in the garage at night. I have the impression the 8 stages of charging is conditioning the battery, in effect bringing the battery up to brand new battery performance. Maybe someone can explain that? At any rate, I am happy with it. I purchased the eyelet cord to leave in place on the truck. I will use some twist ties to run it out the grill for convenience, and keep the hood closed. I can plug in at many locations here. I am reluctant to leave this beautiful charger on the ground. I will purchase the bracket holder to mount it out of sight when I have to use it away from home.
Review: Todo muy bien , es lo que estaba buscando precio y calidad !

## Features

- 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00GODCLYU |
| Best Sellers Rank | #189,731 in Automotive ( See Top 100 in Automotive ) #531 in Battery Chargers |
| Department | Unisex-Adult |
| Item model number | CTK 56-958 |
| Manufacturer | CTEK |
| Product Dimensions | 27.94 x 15.24 x 6.35 cm; 880 g |

## Product Details

- **Brand:** CTEK
- **Colour:** Orange
- **Item weight:** 880 g
- **Output voltage:** 12 Volts (DC)
- **Product dimensions:** 15.2D x 27.9W x 6.4H centimeters

## Images

![CTEK (56-958) MUS 4.3 POLAR 12 Volt Fully Automatic Extreme Climate 8 Step Battery Charger - Image 1](https://m.media-amazon.com/images/I/614lE7RCZtL.jpg)
![CTEK (56-958) MUS 4.3 POLAR 12 Volt Fully Automatic Extreme Climate 8 Step Battery Charger - Image 2](https://m.media-amazon.com/images/I/61JdHmV3m6S.jpg)
![CTEK (56-958) MUS 4.3 POLAR 12 Volt Fully Automatic Extreme Climate 8 Step Battery Charger - Image 3](https://m.media-amazon.com/images/I/61LMtBsz2nL.jpg)
![CTEK (56-958) MUS 4.3 POLAR 12 Volt Fully Automatic Extreme Climate 8 Step Battery Charger - Image 4](https://m.media-amazon.com/images/I/61dp1RfuKwL.jpg)
![CTEK (56-958) MUS 4.3 POLAR 12 Volt Fully Automatic Extreme Climate 8 Step Battery Charger - Image 5](https://m.media-amazon.com/images/I/61mFn5wofCS.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by C***E on 5 December 2025*

CTEK MUS 4.3 Polar Extreme Climate is rated to -22° F ..and so far it hasn't been colder than that. The review is about the cold weather rating, and about the 8 stage charging feature. I wanted to have a battery maintainer to prevent the battery from freezing. It killed all the vehicles batteries last winter because the battery charger maintainer was actually only good to 32° F. The problem wasn't the amps. It was the temperature rating of the device. I would be satisfied however I noticed much better battery charger performance. The car doesn't just start, it starts with vigor. It continues to perform all day no matter how many short trips I have on a cold day. I wouldn't know how much more because it is on the charger in the garage at night. I have the impression the 8 stages of charging is conditioning the battery, in effect bringing the battery up to brand new battery performance. Maybe someone can explain that? At any rate, I am happy with it. I purchased the eyelet cord to leave in place on the truck. I will use some twist ties to run it out the grill for convenience, and keep the hood closed. I can plug in at many locations here. I am reluctant to leave this beautiful charger on the ground. I will purchase the bracket holder to mount it out of sight when I have to use it away from home.

### ⭐⭐⭐⭐⭐ Review
*by P***O on 4 January 2020*

Todo muy bien , es lo que estaba buscando precio y calidad !

### ⭐⭐⭐⭐⭐ Review
*by R***F on 20 February 2016*

This product is the best for the price I see anywhere on internet by far. Some others product was 2 and 3 times the price of this item and lower quality. The charger is really small. Build quality is amazing, will last very long time. I use it every weeks on 2 family's cars and to help friends also. This item is specially designed for really cold weather and it's true. I use it at minus 23 celcius one time and works as fast as when I charge around zero celcius. There's is a battery reconditioning feature, Recommended 1 time a year. I think it's take 1 day for reconditioning at very cold weather but don't know if faster at hot weather. I received it some weeks ago this winter. Also the charger will remove by itself if necessary acid fumes inside the battery to improve its Efficiency. Using this charger often will double the life of your battery. Me and my dad almost not use ours cars so battery lower really fast and this item is an impressive buy. Very thanks for this product, the price was on sale and so much better then others sellers, was the last one so very lucky. I'm a real buyer, the best buy of your life in Canada cold weather. Use it on Costco and other battery using the Same AGM technologies. This charger charge at more high voltage so the best recommendation to buy if using for battery buy in cold weather area. You charge using cold weather feature even if 30 Celsius outside on all car's battery buy in cold weather area because technologies is different then hot USA areas for exemple. So if you life in Florida don't buy this one. There is a different model from this same manufacturer for you at lower price. This Polar version is also able to charge in hot areas battery technology so very flexible product.

## Frequently Bought Together

- CTEK (56-958) MUS 4.3 POLAR 12 Volt Fully Automatic Extreme Climate 8 Step Battery Charger
- CTEK (56-304) Comfort Connect Extension Cable, 8.2 Feet
- CTEK (56-915) Black Bumper

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-01-30*