Colokan di kamar kos hanya satu, jadi saya harus bergantian mengisi daya ponsel dan laptop.

In this sentence, colokan means a power outlet / wall socket.

This word can be a little tricky because in everyday Indonesian it may relate broadly to something that is plugged in. But here, because of hanya satu and the context of charging devices, it clearly means there is only one outlet available.

A very common alternative is stopkontak, which is often clearer if you specifically mean the wall socket.

Kamar kos means a rented room, usually in a boarding house or a simple rooming-house arrangement.

• kos comes from indekos
• kamar kos = a room in that kind of place

This is very common in Indonesia for students and workers living away from home. So di kamar kos means in my boarding room / in the rented room.

You may see both kos and kost in real life. Both are used in Indonesia.

• kos is a common standard spelling
• kost is also very common in signs, ads, and casual writing

So kamar kos and kamar kost are both natural in everyday Indonesian. In your sentence, kamar kos is perfectly fine.

Indonesian often leaves out ada when the meaning is already clear.

So:

• Colokan di kamar kos hanya satu = natural and concise
• Colokan di kamar kos hanya ada satu = also correct

Both mean basically the same thing. The version without ada sounds very natural in everyday Indonesian.

A more explicitly existential version would be:

• Di kamar kos hanya ada satu colokan.

That is also very common.

In Indonesian, classifiers are not required in most ordinary counting situations.

So:

• satu colokan = one outlet

is completely normal.

You do not need something like a classifier the way some Asian languages require one. Indonesian can use classifiers in certain contexts, but for everyday nouns like this, people usually just say the number directly.

Here jadi means so, therefore, or as a result.

It connects the first idea to the consequence:

• There is only one outlet
• jadi = so / therefore
• I have to take turns charging my phone and laptop

In conversation, jadi is a very common way to link cause and result.

Other possible connectors are:

• maka — more formal/literary
• karena itu — because of that / therefore
• makanya — so that’s why (more colloquial)

Bergantian means taking turns or alternating.

It comes from ganti, which has the basic idea of change / replace / switch.

So bergantian gives the sense of doing something one after the other in turns.

In this sentence, it means the speaker cannot charge both devices at the same time, so they must charge them alternately.

For example:

• Kami bergantian memakai kamar mandi.
  We take turns using the bathroom.

• Mereka bergantian berbicara.
  They spoke one after another / took turns speaking.

The structure is:

• harus = must / have to
• bergantian = take turns / alternately
• mengisi daya = charge

So literally it is something like:

• must alternately charge

This is very normal in Indonesian. A verb or verbal expression can follow harus directly.

The idea is that bergantian describes how the charging has to be done.

You could think of it as:

• Saya harus [bergantian] [mengisi daya ponsel dan laptop].

In natural English, that becomes:

• I have to take turns charging my phone and laptop.

Literally, mengisi daya means to fill with power/energy.

• mengisi = to fill
• daya = power, energy

So this is the standard Indonesian way to say to charge a device.

It is a good, relatively standard expression.

In everyday speech, many people also say:

• ngecas
• cas / charge

For example:

• Saya mau ngecas HP dulu.
  I want to charge my phone first.

But mengisi daya is a very good phrase to learn because it is standard and widely understood.

Yes, ponsel is correct and widely understood. It is a standard Indonesian word for mobile phone / cell phone.

However, in everyday speech, many Indonesians more often say:

• HP
• handphone

So all of these may appear:

• ponsel
• telepon genggam
• HP / handphone

Among these, ponsel sounds standard and natural, while HP is extremely common in casual speech.

No, that is not necessary in Indonesian.

In ponsel dan laptop, the meaning is naturally understood as the two things being charged. Indonesian often avoids repeating words that English might repeat.

Also, possessive words are often omitted if the meaning is obvious from context. So even if English says my phone and my laptop, Indonesian can simply say:

• ponsel dan laptop

If needed, you could make it more explicit:

• ponsel saya dan laptop saya

But that would usually sound unnecessary here.

Yes. Indonesian word order is fairly flexible as long as the meaning stays clear.

For example, you could also say:

• Karena colokan di kamar kos hanya satu, saya harus bergantian mengisi daya ponsel dan laptop.
• Saya harus bergantian mengisi daya ponsel dan laptop karena colokan di kamar kos hanya satu.
• Di kamar kos hanya ada satu colokan, jadi saya harus bergantian mengisi daya ponsel dan laptop.

All of these are natural. The original sentence is a good, smooth everyday version.

Di is the basic preposition for location: in, at, on, depending on context.

So:

• di kamar kos = in the boarding room

This is the most natural choice.

Dalam means inside or within, and it gives more emphasis to the interior. It is possible in some contexts, but here it would sound less natural than simple di.

So for ordinary location, di kamar kos is exactly what you would expect.

It is neutral and natural, leaning slightly toward standard Indonesian because of words like ponsel and mengisi daya.

Parts of it are very everyday:

• kamar kos
• jadi
• harus

But if someone were speaking very casually, they might say something like:

• Colokan di kos cuma satu, jadi saya harus gantian ngecas HP sama laptop.

That version is more colloquial.

Your original sentence is a nice model because it is natural but still fairly standard.