Mañana compraré pilas nuevas para la linterna y para el mando.

Mañana can mean either tomorrow or morning, depending on context.

In Mañana compraré..., it means tomorrow because it is being used as a time expression for the whole sentence.

If it meant morning, you would usually see something like por la mañana = in the morning.

Compraré means I will buy.

It comes from the verb comprar = to buy.
This is the 1st person singular simple future form.

• comprar = to buy
• compraré = I will buy

The ending -é shows that the subject is I.

In Spanish, subject pronouns are often omitted because the verb ending already tells you who the subject is.

So:

• compraré already means I will buy
• yo compraré is also possible, but usually only used for emphasis or contrast

For example:

• Mañana compraré pilas... = normal, natural
• Yo compraré pilas... = more emphatic, like I will buy them

Both can mean I will buy, but they are formed differently:

• compraré = simple future
• voy a comprar = near future, literally I am going to buy

In many everyday situations, especially in spoken Spanish, voy a comprar is very common.
But compraré is also completely natural and correct.

This sentence sounds a little more straightforward or slightly more formal/planned than Mañana voy a comprar..., but both work well.

In Spain, pila usually means a small household battery, like the kind used in:

• a torch/flashlight
• a remote control
• a toy

Batería is more often used for larger batteries or battery packs, such as:

• a car battery
• a phone battery
• a laptop battery

So for a flashlight and a remote, pilas is the most natural word.

In Spanish, adjectives usually come after the noun.

So:

• pilas nuevas = new batteries

Also, the adjective has to agree with the noun:

• pilas is feminine plural
• so the adjective must also be feminine plural: nuevas

Compare:

• pila nueva = new battery
• pilas nuevas = new batteries
• libro nuevo = new book
• libros nuevos = new books

Para here means for.

It shows the purpose or intended use of the batteries:

• para la linterna = for the flashlight
• para el mando = for the remote control

So the sentence is saying these new batteries are intended to go in those devices.

Repeating para makes the sentence clear and balanced.

• para la linterna y para el mando

This is very natural in Spanish.
You could sometimes omit the second para if the meaning is still clear:

• para la linterna y el mando

But repeating it is often preferred because it sounds clearer and more complete.

Spanish often uses definite articles (el, la, los, las) in places where English might not.

Here, la linterna and el mando mean:

• the flashlight/torch
• the remote control

In context, these probably refer to specific items known to the speaker and listener, such as the flashlight and remote in their home.

Using the articles sounds natural in Spanish.

In Spain, el mando often means the remote control.

A fuller version is el mando a distancia, but in everyday speech people very often shorten it to just el mando.

This is very common in Spain.

In some other Spanish-speaking countries, learners may hear control remoto instead.

Yes. In Spain, linterna is the normal word for a flashlight or torch.

British English learners may naturally connect linterna with torch, while American English learners will usually think of flashlight.

Because the plural noun is pilas = batteries, while linterna and mando are the objects that need them.

So the meaning is:

• batteries for the flashlight
• batteries for the remote control

Each device is singular, even though several batteries may be needed overall.

Yes, y sometimes changes to e before words that begin with an i sound.

For example:

• padre e hijo = father and son

But here the next word is para, which does not begin with an i sound, so it stays y:

• ...la linterna y para el mando

The mark in mañana is actually the letter ñ, not a normal n with an accent.
Ñ is a different letter in Spanish, pronounced like ny in canyon.

So:

• mañana is pronounced roughly ma-NYA-na

In compraré, the accent mark on é shows where the stress goes:

• com-pra-RÉ

It also helps distinguish the future-tense ending clearly in writing.

The structure is:

• Mañana = time expression
• compraré = verb
• pilas nuevas = direct object
• para la linterna y para el mando = purpose/use phrase

So the sentence follows a very normal Spanish pattern:

Time + verb + object + extra information

Spanish word order is flexible, but this version sounds natural and clear.