Learn Arabic (Modern Standard): يحتاج الفني إلى الشاحن لأن البطارية ضعيفة. - The technician needs the charger because the battery is weak.

In Arabic, the verb يحتاج (needs) almost always requires the preposition إلى (to/toward) before the thing that is needed. Even though English just says needs the charger, Arabic says needs to the charger.

How does لأن (because) affect the grammar of the word البطارية (the battery)?

The word لأن is one of the sisters of Inna. This means it must be followed by a noun or attached pronoun, and it changes that noun's case to accusative (mansub). With full vowel endings, it is pronounced لأن البطاريةَ with a fatha on the end.

Does the word الشاحن (the charger) follow a specific pattern?

Yes, شاحن follows the active participle pattern (the doer of an action). It comes from the root verb شحن (to charge or load), so it literally means the charging thing or the charger.

How do we get the word الفني (the technician) from the Arabic root for art?

The base word فن means art, skill, or technique. By adding the Nisba suffix (a double ي at the end), we change it into the adjective فني (technical). In this sentence, it functions as a noun meaning a technical person or technician.