Sound and battery really poor

Hi jasmina99,

With the issues you're experiencing with your iPhone speakers and microphone, there are some steps you can follow to resolve this. First, use the guidance below to help with microphone issues:

If people can't hear you on phone or FaceTime calls

1. Open the Voice Memos app. 

2. Tap the Record button , speak at the bottom of your phone, then stop the recording. 

3. When you play back the memo, you should hear your voice clearly.

If people can't hear you when you're using speakerphone 

1. Open the Camera app.

2. Record a video while speaking at the top of your iPhone.

3. Tap the camera chooser  to switch to the other camera. Then record another video while speaking at the top of your iPhone.

4. When you play back the videos, you should hear your voice clearly.

If the microphone doesn't work in a specific app

1. Go to Settings > Privacy > Microphone.

2. Make sure that the app is enabled.

3. If the app has permission to access your microphone, or if it isn't listed, contact the app developer.

This information is from If the microphones on your iPhone aren't working - Apple Support.

After those steps, you can test the speaker and potentially resolve speaker issues with the guidance from this article: If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support

You also mentioned the battery life on your iPhone is low. Are you referring to the Maximum Capacity listed under Settings > Battery > Battery Health? This information can help determine the next steps to take.

Additional guidance about your iPhone battery is here: iPhone Battery and Performance - Apple Support

Cheers.