Vehicle Fitment

  • Universal -- fits any 12V lead-acid or AGM battery application
  • Compatible with: cars, trucks, motorcycles, ATVs, snowmobiles, boats, RVs, lawn tractors
  • Ideal for vehicles stored or operated in extreme cold climates

Fitment Notes

  • 12V lead-acid and AGM batteries only -- does NOT support Lithium (LiFePO4)
  • Charging range: 1.2Ah–110Ah
  • Maintenance range: up to 160Ah
  • For Lithium batteries use CTEK Lithium US (56-926) or CT5 Powersport (40-339)
  • Comfort Connect Extension Cable available: CTEK 56-183 (1.5m / ~5 ft.)

Features

  • Specially adapted cables rated to -22°F (-30°C) extreme cold
  • Snowflake mode -- optimized cold weather charging algorithm
  • 8-step fully automatic charging program
  • Patented automatic desulphation -- revives deeply discharged batteries
  • Reconditioning function -- restores stratified batteries
  • Patented Float/Pulse maintenance -- connect and forget, no overcharge risk
  • Diagnoses battery condition before charging begins
  • IP65 rated -- water and dust resistant
  • Non-sparking, reverse polarity protected, short circuit protected
  • Safe for vehicle electronics -- no need to disconnect battery
  • Made in Sweden

Specifications

  • Part Number: 56-958
  • Model: MUS 4.3 POLAR
  • Input Voltage: 100–240V AC
  • Output Voltage: 12V DC
  • Max Charge Current: 4.3A
  • Charge Program: 8-step automatic
  • Battery Types: Wet (lead-acid), MF, Ca/Ca, AGM
  • Battery Size (Charging): 1.2Ah–110Ah
  • Battery Size (Maintenance): Up to 160Ah
  • Operating Temperature: -22°F to 104°F (-30°C to 40°C)
  • IP Rating: IP65
  • Country of Origin: Sweden

Included Components

  • 1x CTEK MUS 4.3 POLAR charger
  • Cold-rated clamp cables
  • Eyelet connector cables

Product Description

The CTEK 56-958 is the MUS 4.3 POLAR -- a fully automatic 12V, 4.3A battery charger engineered specifically for extreme cold weather conditions down to -22°F (-30°C). The specially adapted cables and cold-weather Snowflake charging algorithm ensure reliable, optimized charging performance in the harshest winter environments, making it the ideal charger for snowmobiles, ATVs, trucks, and any vehicle operating or stored in severe cold. The 8-step charging program includes patented automatic desulphation to revive neglected batteries, a reconditioning function to restore deeply discharged or stratified batteries, and patented Float/Pulse maintenance for safe long-term storage connection.

IP65 rated for water and dust resistance. Non-sparking, reverse polarity protected, and short circuit protected -- safe to connect to vehicle electronics without disconnecting the battery. Supports lead-acid and AGM battery types only; not compatible with Lithium batteries. Comfort Connect Extension Cable (CTEK 56-183) available separately. Made in Sweden.



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