Se il computer portatile ha poca batteria, lo collego alla presa vicino alla finestra.

Se means if. It introduces a condition:

• Se il computer portatile ha poca batteria = If the laptop has little battery / if the laptop is low on battery

This is a very common pattern in Italian:

• Se + present tense, present tense

It can describe a general habit or something that usually happens.

Italian often uses the present tense for general situations or routine actions, just like English can do:

• If the laptop has little battery, I plug it in...

Here, the speaker is not talking about one single future event only. It sounds like a normal rule or habit: whenever this happens, this is what I do.

• ha = has
• collego = I connect / I plug in

Il computer portatile literally means the portable computer, i.e. the laptop.

Yes, this is correct Italian. However, in everyday speech many Italians also simply say:

• il portatile = the laptop

So these are both common:

• il computer portatile
• il portatile

In Italian, you normally say a device has battery, not is battery. So:

• ha poca batteria = it has little battery / it is low on battery

This is the natural Italian structure.

Other similar examples:

• Il telefono ha poca batteria.
• Il tablet ha ancora batteria.

Italian often uses avere here where English may say to be low on battery.

Poca means little / not much. It agrees with batteria, which is feminine singular.

So:

• poco = masculine singular
• poca = feminine singular
• pochi = masculine plural
• poche = feminine plural

Because batteria is feminine singular, Italian uses poca.

Lo is a direct object pronoun meaning it. It refers back to il computer portatile.

So:

• il computer portatile is masculine singular
• the matching direct object pronoun is lo

That is why Italian says:

• lo collego = I connect it / I plug it in

Italian normally puts this kind of pronoun before the conjugated verb.

Because in Italian, unstressed direct object pronouns usually come before the verb.

So:

• Lo collego = correct
• Collego lo = not correct in standard Italian

This is a key difference from English. English says:

• I connect it

Italian says:

• Lo collego

Yes, in this context collegare can mean to connect or to plug in.

So lo collego alla presa means:

• I plug it into the outlet
• literally, I connect it to the outlet

Depending on context, Italians might also use other verbs, but collegare is perfectly natural here.

Alla is a contraction of:

• a = to
• la = the

So:

• a + la = alla

Since presa is feminine singular, Italian uses la presa, and therefore:

• collegare alla presa = to plug into the outlet/socket

Here presa means electrical outlet / socket.

So:

• la presa = the outlet / the socket

In this sentence, it clearly refers to the wall outlet where you plug in the laptop charger.

Here vicino is being used as an adverb/preposition-like word meaning near:

• alla presa vicino alla finestra = to the outlet near the window

In this use, vicino a means near to and does not need to agree like an adjective would in the same way you may expect.

A useful chunk to remember is:

• vicino a = near

Examples:

• vicino alla porta = near the door
• vicino al tavolo = near the table

It tells you where the laptop is being connected.

The structure is:

• collego = I connect / plug in
• lo = it
• alla presa = to the outlet
• vicino alla finestra = near the window

So vicino alla finestra describes la presa, not the action itself. It means it is the outlet that is near the window.

Yes, that can also work in everyday Italian. Attaccare can be used informally for plugging in a device.

But there is a small nuance:

• collegare sounds a bit more neutral/formal: to connect
• attaccare can sound more everyday: to plug in / attach

So your original sentence with collego is absolutely good and natural.

The main thing to remember is that Italian often talks about battery level with avere:

• ha poca batteria = it has little battery
• non ha batteria = it has no battery
• ha ancora batteria = it still has battery

This may feel slightly different from English, which often prefers:

• it is low on battery
• it is out of battery

But in Italian, avere batteria is very natural.

Most naturally, it sounds like a general habit or usual response:

• If the laptop is low on battery, I plug it into the outlet near the window.

Italian uses the present tense very often for this kind of meaning. If you wanted to make the future idea more explicit, Italian could use future forms, but the present tense here is completely normal and idiomatic.