CTEK MXS 3.8 12V 3.8A Battery Charger






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Product Description

CTEK MXS 3.8 12V 3.8A Battery Charger, 5 year warranty

The ideal charger for everyday use

Fast, all weather charging

The MXS 3.8 is an advanced battery charger and maintainer. It has selectable programs for use on different sized batteries and special programs for desulphation, and charging on cold days.

The MXS 3.8 microprocessor controlled 7 step battery charger and maintainer is suitable for batteries from 1.2Ah-85Ah. Features include battery diagnosis to establish whether your battery can receive and retain a charge, a patented desulphation program and a ‘Snowflake’ program for charging on cold days. It also includes selectable programs for charging smaller and normal batteries. The MXS 3.8 uses CTEK’s patented float/pulse system, which is the most efficient maintenance mode when a battery is connected for long periods. The MXS 3.8 is simple to use and you can follow the whole charging process on the clear, easy to read display.

Fully automatic ‘click and connect’ 7 step charging
Smaller battery, normal battery and cold weather programs
Charges batteries up to 85A
Reverse polarity protected
5-year warranty

Technical information

  • Input 220–240VAC, 50–60Hz, 0.5A max
  • Output 14.4V/14.7V, 3.8A max
  • Start voltage 2.0V
  • Back current drain* Corresponding to less than 1Ah/month
  • Ambient temperature -20˚C to +50˚C
  • Battery types All types of lead-acid batteries, 12V, WET, MF, Ca/Ca, AGM, GEL
  • Battery capacity 1.2–130Ah
  • Warranty 5 years
  • Insulation class IP65

CTEK CT3800/12 Product BrochureCTEK CT3800/12 Product Manual



Brand CTEK

GTIN 7350009569880

Warranty Period: 5 Years

Product Category Battery Chargers

Model MXS3.8

Output Current Rating (Amps) 3.8

Start Voltage 2.0V

Output System Voltage 12V

Output 14.4V/14.7V, 3.8A max

Dimensions 168 x 65 x 38 mm (L x W x H)

Charger Voltage 12V

Net Weight (kg) 0.6

Ambient Temperature -20˚C to +50˚C

Battery Capacity 1.2–130Ah

Insulation Class IP65

Back Current Drain Corresponding to less than 1Ah/month

Input 220–240VAC, 50–60Hz, 0.5A max

Battery Types All types of lead-acid batteries, 12V, WET, MF, Ca/Ca, AGM, GEL


Tutorials - CTEK MXS 3.8 - What is in the box


Tutorials - CTEK MXS 3.8 - How to connect


Tutorials - CTEK MXS 3.8 - Charging


CTEK 8 Step Charging


CTEK MXS 3.8 12V 3.8A Battery Charger Product Review




Product Q&A

Ask Us a Question
  • What size battery charger do I need for my lead acid battery I have in my camper?

    A good battery charger rule of thumb for charging a lead acid battery, is using a charger with output current (amps) of 10-20% of the battery total stored capacity (Ah).

    So, for example if the battery is 12V 100Ah, the charger need to be minimum of 10A and maximum of 20A.  Often splitting the difference at 15% (so a 12V ~15A charger) is a good option. Happy charging!


    For details relating to this product's warranty CLICK HERE


    For details relating to our delivery process CLICK HERE

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