Возьми зарядку с собой: она пригодится в дороге.

Take the charger with you: it will come in handy on the road.

Breakdown of Возьми зарядку с собой: она пригодится в дороге.

• с: with
• дорога: the road
• в: on
• взять: to take

Questions & Answers about Возьми зарядку с собой: она пригодится в дороге.

Why does зарядку end in -у? What case is that?

Зарядка is feminine nominative singular. After возьми (take), the direct object goes in the accusative.
For most feminine nouns ending in -а / -я, the accusative singular changes to -у / -ю:

• зарядка (Nom.) → зарядку (Acc.)
  So the phrase literally is Take (a) charger.

What’s the difference between Возьми and Бери here?

Both can translate as take, but the aspect changes the nuance:

• Возьми (imperative of perfective взять) = take it (once), make sure you take it → a single, completed action.
• Бери (imperative of imperfective брать) = take (in general / habitually / start taking), or can sound like go ahead, take it depending on context.
  In advice like this, Возьми is very common because it means don’t forget—take it with you.

Why is it с собой and not с тобой?