Battery maintenance is not just a single procedure
When an electric vehicle’s high-voltage battery needs maintenance, a successful result is not only about getting one identified issue temporarily under control.
It is equally important to make sure that after the service, the battery is as dry, sealed and safe as possible, and ready for the kilometres ahead.
The high-voltage battery is the most valuable single component in an electric vehicle. Maintaining it, removing moisture, ensuring sealing and carrying out final testing require far more than traditional workshop expertise.
That is why it matters who does the work.
An EV battery is not a standard service item
General workshops do excellent work with brakes, suspension, air conditioning and scheduled maintenance. A high-voltage battery, however, is a world of its own.
It is a complex system that combines:
- high-voltage technology
- electronics
- mechanical structures
- sealing solutions
- moisture management
- safety requirements
Even one overlooked detail can lead to significant damage later on.
A moisture problem is not solved by surface drying alone
When moisture enters the battery enclosure, the issue is usually not limited to temporary humidity or a single visible amount of water.
Moisture can spread into the battery structures, initiate corrosion, weaken insulation resistance and later cause fault messages or other malfunctions.
That is why high-quality battery maintenance must ensure that:
- moisture is removed as effectively as possible
- external signs of corrosion and risk areas are inspected
- service points affecting battery sealing are handled
- battery sealing is restored to the manufacturer’s required level
- the success of the work is verified with final testing
High-quality battery maintenance is therefore not one quick step, but a carefully executed process.
One of the most critical stages is removing moisture
If moisture has entered the battery enclosure, removing it is one of the most important stages of the entire maintenance process.
Moisture is not only a temporary problem. It can initiate corrosion inside the battery, weaken insulation resistance and later cause fault messages or other malfunctions.
This is why moisture removal must not be left incomplete.
In many places, batteries are dried by blowing warm air into them. This may temporarily improve the situation and, for example, return the battery’s insulation resistance to a normal level.
The problem is that warm air alone may not remove nearly all the moisture from the battery.
The structure of a high-voltage battery is complex, and moisture can remain in different parts of the enclosure, between structures, around cell modules and in hard-to-reach areas. Even if the measurement result looks better for a while, moisture left inside the battery can quickly redistribute throughout different parts of the battery.
As a result, the same problem may return later.
For this reason, Akkuauto has developed its own specialist equipment and method for battery drying. The purpose is to remove moisture as effectively as possible, including from those parts of the battery structure that traditional warm-air drying may not reach sufficiently well.
In practice, the goal is not simply to make the battery look better in measurements for a short time.
The goal is to prevent moisture from remaining inside the battery, where it could later cause new corrosion damage, insulation resistance issues or other problems that weaken battery operation.
This is why the quality of moisture removal can play a decisive role in how well the maintenance holds up in the future.
Battery vent valves – a small detail that can make a big difference
Based on our practical experience, one of the most common moisture entry points is the battery vent valves.
These components are constantly exposed to:
- water
- water spray lifted by the tyres
- road salt
- temperature changes
- mechanical stress
If the condition of the valve deteriorates or its sealing fails, moisture can enter the battery enclosure unnoticed.
That is why inspecting the vent valves and replacing them when necessary is an essential part of high-quality battery maintenance.
Careful final testing confirms a successful result
Once the battery maintenance has been completed, the work is not finished without careful final testing.
Without proper final testing, it is not possible to confirm that the battery enclosure meets its sealing requirements after the service.
That is why a battery serviced by Akkuauto undergoes a pressure test.
The pressure test verifies that:
- the seals function correctly
- the feedthroughs are in good condition
- the vent valves are sealed
- the battery enclosure meets the required sealing level
Maintaining the battery is therefore only part of the work. It is equally important to confirm that the battery is as dry and sealed as possible, and ready for safe use in the future.
When afterwork is incomplete, the same issue can return
Akkuauto regularly receives vehicles whose batteries have previously been handled elsewhere.
In many cases, the original issue has been temporarily brought under control. The problem has been that post-service checks, sealing verification or moisture management have been incomplete.
As a result, moisture has later entered the structures again, or moisture left inside the battery has started to cause problems again.
This is why successful battery maintenance must not be based on assumptions. It must be based on inspection, the right methods, documentation and a verified result.
Reliable battery maintenance is much more than clearing fault codes
High-quality high-voltage battery maintenance includes:
- electrical diagnostics
- mechanical inspection
- moisture management
- assessment of external corrosion and damage risks
- battery drying with methods suitable for the purpose
- sealing verification
- documentation
- final testing
Only then can battery maintenance be considered genuinely successful.
When it comes to the most expensive component in your car, details matter
High-voltage battery maintenance is not work where assumptions are enough.
It must be verified that the battery is:
- as dry as possible
- intact
- sealed
- safe
And above all, ready to withstand the coming years in Nordic conditions.
That is why it matters where EV battery maintenance is done.
If you want to confirm the condition of your electric vehicle’s battery, or if you suspect risks related to moisture, corrosion or sealing, a thorough battery inspection gives you a clear overall picture before small issues become major ones.