MultiCharger 1203 battery charger, white background

MultiCharger 1203


This product is expired. It has been replaced by Multicharger 1205R Flex.

Art. nr: 450009


This product is expired. It has been replaced by Multicharger 1205R Flex.

Comfort functions like defrosters and seat heaters require a lot of power from the battery. Modern cars also depend on advanced electronics that increases the load on the battery. A normal driving pattern will not keep the battery sufficiently charged over time.

Routine charging is necessary to prevent the battery from becoming discharged and degraded


  • Modern switch-mode technology preserves your battery and allows the charger to be permanently connected.
  • Temperature-compensated charging ensures becomes fully charged in all conditions.
  • LED indicator for charging mode and quick charging mode (green and red).
  • If the battery experiences sufficient load during trickle charging to drop the voltage below 13V, the charger automatically switches to full-power mode (quick charge).
  • Short-circuit protection and reverse-polarity protection. This requires the installation of the fuse included with the charger.
  • 230V recognition prevents the relay from staying on and discharging the battery when the charger is not in use.
  • 2 relay-controlled outputs for engine and parking heaters which can be activated with a time-program control unit (external signal).
  • Will not damage the vehicles electronic systems.
  • Compact dimensions.
  • Prevents battery degradation (sulphating) and extends the lifetime of the battery.
  • Prevents release of harmful gases.

MultiCharger 1203 can be used to charge all open or closed types of 12V lead/acid inclusive AGM and GEL batteries. It has a built in relay function for control of engine and interior heaters.

MultiCharger 1203 is included in WarmUp kits.

Technical description

Effect: 3A at 12V.

DEFA AS conforms to the requirements of both ISO 9001- 2008, ISO 14001:2004 and OHSAS 18001:2007. In addition, our engine heaters and cables conform to the requirements of ISO/TS 16949:2002.

Rated output/power
Charging current
Operating temperature
Boost mode
Maintenance charging
IP rating
Cable cross section
3/12 A/V
-40°C / +40°C
> 14,7V
EN 50081-1, EN 50082-1 EN 60335-1, EN 60 335-2-29