Dersom batterinivået blir lavt, slår vi av bildestabiliseringen.

Dersom means if. It is very similar to hvis, which also means if.

The main difference is style:

• dersom often sounds a bit more formal or written
• hvis is very common in everyday speech and writing

So:

• Dersom batterinivået blir lavt ...
• Hvis batterinivået blir lavt ...

Both are correct.

Norwegian very often forms compound nouns as a single word, much more than English does.

So:

• batteri = battery
• nivå = level
• batterinivå = battery level

Then -et is added because the noun is in the definite form:

• et batterinivå = a battery level
• batterinivået = the battery level

So batterinivået literally means the battery level.

It is the definite ending for a neuter noun.

The noun nivå is neuter:

• et nivå = a level
• nivået = the level

In the compound batterinivået, the last part determines the gender, so the whole compound is also neuter:

• et batterinivå
• batterinivået

This is a very common pattern in Norwegian.

Blir means becomes / gets, while er means is.

So:

• blir lavt = becomes low / gets low
• er lavt = is low

In this sentence, blir lavt suggests a change of state: the battery level drops and reaches a low level.

If you said Dersom batterinivået er lavt, that would also be grammatical, but the meaning is slightly different:

• blir lavt focuses on it becoming low
• er lavt focuses on it already being low

Because lavt agrees with the noun it describes.

The noun batterinivå is neuter:

• et batterinivå

When an adjective is used with a neuter singular noun, it usually gets -t:

• lav = low
• lavt = low, used with a neuter singular noun

So:

• et lavt nivå = a low level
• batterinivået blir lavt = the battery level becomes low

Compare:

• en lav temperatur
• et lavt nivå

This is because Norwegian follows the verb-second rule in main clauses.

The sentence begins with the subordinate clause:

• Dersom batterinivået blir lavt

After that comes the main clause. In Norwegian main clauses, the finite verb usually comes in the second position. Since the subordinate clause takes the first position, the verb comes before the subject:

• Dersom batterinivået blir lavt, slår vi av bildestabiliseringen.

So the order is:

1. subordinate clause
2. finite verb = slår
3. subject = vi

If the main clause stood alone, you would say:

• Vi slår av bildestabiliseringen.

Yes, slå av is a phrasal verb-like expression meaning turn off or switch off.

In many Norwegian main clauses, the particle is separated from the verb:

• Vi slår av kameraet. = We turn off the camera.

So here:

• slår = turn
• av = off

Together:

• slår av = turn off

In some other structures, the two parts can appear together more closely, for example in infinitive form:

• å slå av = to turn off

Again, this is because Norwegian commonly writes compound nouns as one word.

It is built from:

• bilde = image / picture
• stabilisering = stabilization

So:

• bildestabilisering = image stabilization

Then -en makes it definite:

• en bildestabilisering = an image stabilization system / image stabilization
• bildestabiliseringen = the image stabilization

In natural English, this is often translated as image stabilization rather than word-for-word.

Because the nouns have different grammatical genders.

• nivå is neuter: et nivå → nivået
• stabilisering is masculine/feminine in standard Bokmål usage here, usually treated as masculine: en stabilisering → stabiliseringen

So:

• batterinivået = the battery level
• bildestabiliseringen = the image stabilization

In Norwegian, the definite ending depends on the gender of the noun.

Yes. That would be completely natural.

Using hvis instead of dersom does not change the basic meaning. The main difference is tone:

• dersom = slightly more formal or technical
• hvis = very common and everyday

In a product manual or technical text, dersom fits very well.

The comma separates the subordinate clause from the main clause:

• Dersom batterinivået blir lavt = subordinate clause
• slår vi av bildestabiliseringen = main clause

This kind of comma is standard in Norwegian when a subordinate clause comes first. It helps show the structure clearly.