MultiCharger Flex

Keep your batteries fully charged

Modern vehicles have many electronic features that draw power from the battery. Without regular charging, it may quickly become discharged and degraded. Our compact & powerful MultiCharger flex series keeps your battery fully charged.

A safe start every morning

Cold weather, comfort functions and a normal driving pattern with many short trips will deplete your battery faster than it can be recharged by the alternator. When the battery becomes discharged, it will no longer be able to start your car. A MultiCharger keeps your battery fully charged and ready to start your car.

Improved battery lifetime

A consistently insufficient charging level or repeated discharges degrades your battery. When this happens, replacing it is often the only alternative. Discarding batteries too soon is both expensive and a danger to the environment. A MultiCharger significantly prolongs the life expectancy of your battery.

Full control on your mobile phone

The DEFA app gives you full control over your WarmUp system, including your battery status. The app will also send you alerts if the cable is not connected when you park your car, or if the cable is still connected when you start the car. MultiCharger 1205R Flex is now included in all WarmUp kits.

Our new Flex chargers are now available!

Our new Flex chargers are powerful, compact and come with flexible cables and brackets that makes them much easier to install!

Read more
MultiCharger 1205R Flex battery charger, laying, white background


  • Easy to install – Compact size with flexible cables and bracket.
  • Modern switch-mode technology preserves your battery and makes it possible for the charger to remain connected.
  • Temperature compensated charging voltage provides optimal charging in all conditions..
  • Automatic switch to full-power mode (quick charge) if the battery voltage falls below 13V during charging.
  • Short-circuit and reverse-polarity protection.
  • 2 relay controlled outputs for engine and parking heaters which can be activated with a control unit.
  • Will not damage the vehicle’s sensitive electronic systems.
  • Prevents battery degradation (sulphating) and extends the lifetime of the battery.
  • Prevents release of harmful gases.

MultiChargers can be used to charge all 12V lead/acid batteries, including AGM and GEL.