CTEK 4.3 Test & Charge 12V Battery Charger — 8‑Step Automatic Charging, Alternator & Battery Testing (Up to 160 Ah)

CTEK 4.3 Test & Charge is a 12 V fully automatic charger that tests, recovers, charges and maintains lead-acid batteries while also verifying alternator performance.

Designed for car, motorcycle and small-vehicle batteries, the CTEK 4.3 Test & Charge combines a patented 8-step charging algorithm with built-in diagnostics so you can plug in, choose a program and leave the unit to manage battery health. It supports all lead-acid types—including flooded, GEL, AGM and LiFePO4-compatible modes—and is suitable for batteries up to 160 Ah. Safety features like spark-free connection and reverse-polarity protection protect both the user and vehicle electronics during charging.

How does the CTEK 4.3 recover and maintain batteries?

The charger uses an 8-step charging routine that assesses battery condition, delivers recovery currents when needed and finishes with float and pulse maintenance to preserve capacity during storage. Maintenance mode prevents self-discharge and avoids overcharging.

• 8-step algorithm: desulfation, soft start, bulk charge, absorption, analysis, reconditioning, float and pulse maintenance
• Automatic recovery for deeply discharged batteries
• Float/pulse maintenance for long-term storage without damage

What tests does it run on batteries and alternators?

CTEK 4.3 Test & Charge includes three diagnostic programs: battery condition test, alternator/load test and a combined evaluation. These quick checks help you identify weak batteries or charging-system faults before they cause breakdowns.

• Battery test estimates state of charge and health
• Alternator test verifies charging performance under simulated load
• Combined tests give a clear picture of vehicle charging system reliability

Is it safe and easy to use on modern vehicles?

The unit provides clean, regulated output with no spikes, protecting sensitive electronics. Simple plug-and-play design requires selecting a programme and connecting via clamp or eyelet—no complex setup needed.

• Spark-free connection and reverse-polarity protection for user safety
• Exceptionally smooth voltage and current to protect vehicle electronics
• Clamps and eyelet options for workshop or permanent mounting

What battery sizes and types are supported?

Ideal for small to medium automotive batteries, the 4.3 Test & Charge handles batteries up to 160 Ah and covers a wide range of lead-acid chemistries. Select the appropriate program for best results.

• Compatible with flooded, GEL and AGM lead-acid batteries
• LiFePO4 mode included for compatible lithium batteries
• Suitable for batteries from motorcycles to passenger cars and some light commercial applications

Who is this for: The CTEK 4.3 Test & Charge is built for vehicle owners, mechanics and fleet operators who want reliable, automatic battery care and clear charging-system diagnostics. It’s especially useful if you store vehicles for long periods, maintain a workshop, or want to avoid unexpected battery failures without needing advanced technical skills.