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La batteria di questo robot ricaricabile non è sostituibile.

La batteria di questo robot ricaricabile non è sostituibile.
The battery of this rechargeable robot is not replaceable.
From Lesson 343:Adjectives of possibility (-bile)·Italian

Questions & Answers about La batteria di questo robot ricaricabile non è sostituibile.

How do we know whether to use -abile or -ibile when forming these adjectives?
The vowel in the suffix depends on the verb's infinitive ending. For -are verbs like ricaricare, we use -abile to make ricaricabile. For -ere and -ire verbs, such as sostituire, we use -ibile to make sostituibile.
Does the suffix -bile always function like the English '-able' or '-ible'?
Yes, in almost all cases. Adding -abile or -ibile to a verb creates an adjective describing capability or possibility. Just as in English, ricaricabile indicates the battery can be recharged, and sostituibile means it can be substituted or replaced.
Why is the foreign word robot paired with the masculine questo?
Foreign loanwords that end in a consonant, like robot, are almost always treated as masculine in Italian. Therefore, it requires the masculine singular demonstrative adjective questo. Keep in mind that these loanwords are also invariable, so the plural remains i robot.
If we were talking about multiple batteries, how would sostituibile change?
Adjectives ending in -e, including all those formed with the suffix -bile, have the same singular form for both masculine and feminine nouns. However, they must change to -i in the plural. So, if the batteries were plural, you would say le batterie non sono sostituibili.

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