CTEK MXS 3.8 Power Kit 40-765 Automatic 12V 3.8A IP65 Car Battery Charger

For car owners who need reliable battery maintenance at home or in the workshop, the CTEK MXS 3.8 Power Kit offers automatic multi-stage charging for 12V lead-acid batteries. With a maximum current of 3.8A and an IP65-rated housing, it handles everything from small cars to larger vehicles, even in dusty or damp conditions.

Key specifications

• Battery voltage: 12V
• Max charging current: 3.8A
• Number of charging steps: 4
• Supported battery types: All 12V lead-acid (WET, MF, Ca/Ca, AGM, GEL)
• Battery capacity (charging): 1.2–80Ah
• Battery capacity (maintenance): 1.2–130Ah
• Input voltage: 220–240V AC, 50–60Hz
• Output voltage (nominal): 14.4V / 14.7V (Cold Weather Mode)
• IP protection class: IP65 (splash and dust proof)
• Desulphation mode: Yes
• Cold weather mode: Yes
• Reverse polarity protection: Yes
• Short-circuit protection: Yes
• Spark-free operation: Yes
• Back current drain: <1Ah/month
• Ripple: <4%
• Operating temperature: -20°C to +50°C
• Included accessories: Comfort Connect eyelet terminal, storage bag

Why choose it

The MXS 3.8 uses CTEK's proven four-step charging process to safely restore and maintain battery health. Its IP65 rating means you can use it outdoors without worry, and the included eyelet terminal allows permanent connection for easy access. The cold weather mode adjusts voltage for optimal charging in low temperatures.

Ideal use cases

• Regular maintenance charging for cars, motorcycles, and classic vehicles
• Charging batteries in outdoor or humid environments
• Long-term storage maintenance to prevent sulphation
• Quick top-ups before a journey

Good to know

The charger is spark-free and protected against reverse polarity and short circuits, making it safe for beginners. It draws less than 1Ah per month from the battery when not charging, so you can leave it connected without draining the battery.