Var vi än sitter kan vi titta på hennes bilder tillsammans, så länge batteriet räcker.

It is a common Swedish pattern meaning wherever we sit or no matter where we sit.

The pattern is:

• var = where
• än = adds the sense of no matter / ever
• var ... än = wherever / no matter where

So:

• Var vi än sitter = Wherever we sit
• literally something like Where we may sit

You can compare it with similar patterns:

• vad du än säger = whatever you say
• hur det än går = however it goes
• vem det än är = whoever it is

Here än does not mean than.

Because var is used for location and vart is used for direction/movement.

In this sentence, sitter describes being in a place, not moving toward one, so Swedish uses var:

• Var vi än sitter = wherever we are sitting

If the idea were movement, Swedish would use vart:

• Vart vi än går = wherever we go

This is the same basic distinction as:

• Var är du? = Where are you?
• Vart går du? = Where are you going?

Because Swedish main clauses follow the V2 rule: the finite verb usually comes in the second position.

The first part of the sentence, Var vi än sitter, takes the first position as a whole. That means the finite verb in the main clause must come next:

• Var vi än sitter kan vi titta ...

So the order is:

1. fronted clause: Var vi än sitter
2. finite verb: kan
3. subject: vi

This is very typical Swedish word order after a fronted element:

• I dag kan vi ses.
• När han kommer börjar vi.
• Var vi än sitter kan vi titta ...

Swedish often prefers a position verb where English might simply use be.

Here, sitta means sit / be seated. Swedish commonly uses it when talking about people being somewhere in a seated position.

So:

• Var vi än sitter = wherever we are sitting / wherever we sit

Using är would sound less natural if the idea is specifically that people are seated somewhere. Swedish often distinguishes:

• sitta = be sitting
• stå = be standing
• ligga = be lying
• vara = be, in a more general sense

In Swedish, titta usually takes the preposition på when it means look at or watch.

So:

• titta på bilder = look at pictures
• titta på TV = watch TV
• titta på henne = look at her

You should learn titta på as a unit here.

Without på, titta often feels incomplete or changes meaning depending on context.

Because sina/sin/sitt is a reflexive possessive, and it refers back to the subject of the same clause.

In the main clause here, the subject is vi:

• kan vi titta på hennes bilder

So the pictures belong to her, not to us. That is why Swedish uses hennes.

Compare:

• Vi tittar på hennes bilder = We are looking at her pictures.
• Hon tittar på sina bilder = She is looking at her own pictures.

If the subject had been hon, then sina might be possible. But with vi as the subject, sina cannot refer to her.

Bilder is the plural of bild, and it can mean:

• pictures
• photos
• images

Which English word sounds best depends on context. In this sentence, it could easily mean photos if the context is someone showing pictures on a phone or tablet.

So hennes bilder could be:

• her pictures
• her photos
• her images

Here så länge means as long as.

It introduces a condition:

• så länge batteriet räcker = as long as the battery lasts / as long as the battery holds out

This is a very common expression in Swedish.

Examples:

• Du får låna bilen så länge du är försiktig. = You can borrow the car as long as you are careful.
• Vi stannar så länge det behövs. = We’ll stay as long as necessary.

So in this sentence, it gives the limit or condition for the action.

Räcker comes from räcka, which often means:

• be enough
• suffice
• last
• hold out

With a battery, räcker means that it has enough power left.

So:

• batteriet räcker = the battery lasts / the battery is enough / the battery holds out

In natural English here, as long as the battery lasts is probably the best translation.

You will also see räcka in other contexts:

• Pengarna räcker inte. = The money isn’t enough.
• Tiden räcker inte. = There isn’t enough time.

Because kan is a modal verb, and modal verbs in Swedish are followed by the infinitive without att.

So:

• kan titta
• not kan att titta

This is the same pattern as with other modal verbs:

• vill gå = want to go
• måste åka = must leave
• ska läsa = will/going to read
• kan titta = can look/watch

So kan vi titta is exactly what you should expect.

Tillsammans means together.

It tells you how the action is done:

• titta på hennes bilder tillsammans = look at her pictures together

Its placement here is natural and clear, but Swedish can sometimes move adverbs around depending on style and emphasis.

For example, these are all understandable, though not always equally natural in every context:

• Vi kan titta på hennes bilder tillsammans.
• Vi kan tillsammans titta på hennes bilder.

The version in your sentence sounds very normal.

In modern Swedish, commas are used less than in English, and punctuation can be somewhat flexible. The comma here helps separate the main statement from the conditional phrase:

• ..., så länge batteriet räcker.

It is understandable and natural. In some contexts, Swedish writers might omit commas where English would strongly prefer them.

So the comma here is mainly helping readability, not changing the grammar.