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UPGRADE EFB TO AGM

START-STOP CAR BATTERY

What must be considered when upgrading technology from start-stop batteries, from EFB to AGM batteries?

The installation location

The installation location and the resulting maximum ambient temperature must be taken into account:

 

In the case of the AGM battery, it is essential to avoid a „build-up“ of thermal load due to (extremely) high ambient temperatures (thermal runaway). 

For this reason, the ambient temperature must not exceed +55 degrees Celsius. +85 degrees Celsius, not an uncommon value in the engine compartment, especially in summer, is considered uncritical for a maximum of 3 hours per day. More than that cause the premature total failure of the AGM battery, because the separator dries out and the grids can become extremely corroded.

 

 

Where is the start-stop battery installed?

  • EFB batteries are usually installed directly in the engine compartment. Exceptions prove the rule, as always.
  • AGM batteries are often installed in the luggage compartment or in the passenger compartment. Recently, however, some car manufacturers have increasingly placed them in the engine compartment, away from the engine block and often equipped with a thermal protection cover.
Motor

Where is the start-stop battery installed?

 

  • EFB batteries are usually installed directly in the engine compartment, exceptions prove the rule, as always.
  • AGM batteries are often installed in the boot or in the passenger compartment. Recently, however, some car manufacturers have also increasingly installed them in the engine compartment, rather away from the engine block and often equipped with a thermal protection cover.

 

 

 

 

EFB battery installed in the engine compartment.

Conclusion

directly next to the engine block (combustion engine), the more heat-insensitive EFB battery with fitted thermal protection cover is to be preferred if this was already installed ex-works as the original battery.