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The CTEK MUS 4.3 (Part No. 56-864) is a charger that offers state of the art technology that was previously only found in CTEK’s professional product range. The charger can solve a broad range of battery-related problems and is the perfect charger for those with high demands. The MUS 4.3 offers features such as 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 display allows the user to follow the entire charging process.

The MUS 4.3 is a fully automatic 8-step charger that delivers selectable 0.8A or 4.3A to 12V batteries from 1.2–110Ah and is suitable for maintenance charging up to 160Ah. The charger is splash and dust-proof, designed to protect vehicle electronics, non-sparking reverse polarity protected, and short-circuit proof. The premium input and output cable with robust strain relief prevent wires from crimping or being pinched. The MUS 4.3 comes with a 5-year warranty.

  • Fully automatic charging and maintenance in 8 steps maximizes battery life and performance
  • Numerous accessories simplify using the same charger for multiple batteries
  • One charger for the car, motorcycle, lawn mower, snowmobile, sump pump, tractor, and other applications
  • Water-resistant so that the solution can be taken to the problem, even if it rains or snows
  • Patented maintenance charge for a unique combination of maximized life and performance
  • Reconditions deeply discharged batteries
  • Patented desulphation that extends the battery life
  • No sparks, short-circuit proof, and reverse-polarity protected for safe and easy usage
  • Automatic detection of end-of-life batteries that eliminates surprises
Technical Data
Part No. 56-864
  • Charging voltage: 14.4 / 14.7 / 15.8 V
  • Charging current: Max 4.3 A
  • Type of charger: 8-step, fully automatic charging cycle
  • Type of battery: 12V lead-acid batteries
  • Battery capacity: 1.2 - 110 Ah, up to 160 Ah for maintenance

“Having owned several of another ‘popular’ brand of charger, the CTEK is far and above superior in every possible category. WELL worth the miniscule additional cost. ”