الفني هيستبدل البطارية.

A natural pronunciation is:

el-fannī hayistabdel el-baṭṭāriyya

A few notes:

• ال is usually pronounced el- in Egyptian Arabic.
• الفني = el-fannī
• هيستبدل = hayistabdel
• البطارية = el-baṭṭāriyya

The stress is roughly:

• el-fan-NĪ
• ha-yis-TAB-del
• el-baṭ-ṭā-RIY-ya

هيستبدل means he will replace.

It can be broken down like this:

• يستبدل = he replaces / he is replacing
• هـ / هيـ = a future marker in Egyptian Arabic, so it makes the verb future

So:

• يستبدل = he replaces
• هيستبدل = he will replace

In Egyptian Arabic, the future is often marked with حـ or هـ / هيـ before the imperfect verb. So هيستبدل is a future form.

It is understandable in Egyptian Arabic, but it sounds a bit more formal or MSA-like than everyday speech.

In casual Egyptian, many speakers would more naturally say:

الفني هيغيّر البطارية
= The technician will change the battery

So:

• هيستبدل = correct, understandable, somewhat formal
• هيغيّر = more everyday and colloquial

A learner should recognize هيستبدل, but also know that هيغيّر may be more common in conversation.

الفني means the technician.

The base word is:

• فني = technician / technical specialist

With the article:

• الفني = the technician

This word is related to فنّي, which often refers to someone skilled in a technical trade, such as repair, maintenance, electronics, etc.

Because both are definite in this sentence:

• الفني = the technician
• البطارية = the battery

In Arabic, if you mean a specific technician and a specific battery, both nouns can take ال.

So the sentence is literally:

the technician will replace the battery

If you wanted an indefinite object, you would not use ال on بطارية.

Because the sentence is talking about the battery, not just a battery.

Compare:

• البطارية = the battery
• بطارية = a battery

So:

• الفني هيستبدل البطارية = The technician will replace the battery.
• الفني هيستبدل بطارية = The technician will replace a battery.

The second version is less specific.

This sentence uses a very common Egyptian Arabic order:

subject + future verb + object

So:

• الفني = subject
• هيستبدل = verb
• البطارية = object

That gives:

الفني هيستبدل البطارية
= The technician will replace the battery

This is very natural in Egyptian Arabic.

You may also hear other word orders in Arabic more generally, but for Egyptian speech, this subject-first order is extremely common.

Yes, it is possible, but it sounds more formal or more like written Arabic than the original sentence.

Compare:

• الفني هيستبدل البطارية = very natural in Egyptian speech
• هيستبدل الفني البطارية = possible, but less conversational

For everyday Egyptian Arabic, the subject-first version is usually the safer choice.

In Egyptian Arabic, a common way to negate a future sentence like this is:

الفني مش هيستبدل البطارية
= The technician will not replace the battery

So you can think of it as:

• مش = not
• هيستبدل = will replace

This is the most useful pattern for learners in speech.

In Egyptian Arabic, you can often make it a yes/no question just by using intonation:

الفني هيستبدل البطارية؟
= Will the technician replace the battery?

Usually, spoken intonation does the job. In everyday Egyptian, you do not usually need a special question word like English will or formal Arabic هل.

Because the nouns after ال begin with moon letters, not sun letters.

Here:

• ف in الفني
• ب in البطارية

Both are moon letters, so the l sound in ال stays pronounced:

• el-fannī
• el-baṭṭāriyya

If the next letter were a sun letter, the l would assimilate.

Both can mean he will replace / change, but they feel a little different.

• هيستبدل = will replace; more formal, more precise
• هيغيّر = will change; very common in everyday Egyptian

In the context of a battery, both can work:

• الفني هيستبدل البطارية
• الفني هيغيّر البطارية

In normal spoken Egyptian, many people would prefer هيغيّر البطارية.

It comes from the root ب د ل, which has to do with changing, substituting, or replacing.

The verb يستبدل is related to Form X in Arabic morphology:

• past: استبدل = he replaced
• present/imperfect: يستبدل = he replaces
• future in Egyptian: هيستبدل = he will replace

A learner does not need to master all the morphology right away, but it helps to know that this is a derived verb with a somewhat formal feel.

Because the word is spelled with a doubled consonant sound: فنّي.

That doubling is important in pronunciation:

• فني here is pronounced fannī
• not fanī

Consonant doubling is very common in Arabic and can affect both pronunciation and meaning.

Yes, بطارية is grammatically feminine.

However, it does not affect the verb here, because the verb agrees with the subject, and the subject is:

• الفني = the technician

So the verb is masculine singular:

• هيستبدل = he will replace

If the subject were feminine, the verb form would change.

You would change the subject and the verb to feminine:

الفنية هتستبدل البطارية
= The female technician will replace the battery

So compare:

• الفني هيستبدل البطارية = the male technician will replace the battery
• الفنية هتستبدل البطارية = the female technician will replace the battery

In Egyptian Arabic, feminine she will is often marked with هتـ before the verb.

Yes. In many everyday contexts, هيستبدل can be translated as either:

• will replace
• is going to replace

English makes finer distinctions sometimes, but Egyptian Arabic often uses the same future form for both ideas.

So the exact English translation depends on context.

Yes—mainly the future marker.

The use of هـ / هيـ before the imperfect verb is characteristic of Egyptian Arabic speech.

In more formal Arabic, you might see something like:

• سيستبدل الفني البطارية
• or سوف يستبدل الفني البطارية

But in Egyptian Arabic, هيستبدل is the key clue that this is dialectal rather than fully formal MSA.

At the same time, the choice of يستبدل itself is a bit more formal than the most everyday colloquial verb choice.