My brand new watch doesn’t hold a charge

Hello Nadeb,

Welcome to Apple Support Communities. 

We understand that you’re concerned about the battery life of your Apple Watch. We are happy to help.

These steps may help. Here’s some information on Apple Watch SE battery life here: Apple Watch - Battery - Apple 

"Apple Watch SE Battery Information

All-Day Battery Life Up to 18 hours

Family Setup Battery Life

Up to 14 hours

Talk

Up to 1.5 hours connected to LTE

Audio Playback

Up to 10 hours playback from Apple Watch storage

Workout

Up to 10 hours indoor workout

Up to 6 hours outdoor workout with GPS

Up to 5 hours outdoor workout with GPS and LTE

Charge

About 1.5 hours to 80%

About 2.5 hours to 100%

CPU Performance

Up to 20% faster than Apple Watch SE (1st generation)"

We recommend these tips to maximize battery life on your Apple Watch: Batteries - Maximizing Performance - Apple

1. "Update to the latest software.
2. Adjust your settings.
3. Enable Low Power Mode.
4. View Battery Usage information
5. To view your battery usage and charging history, open the Settings app on your Apple Watch and go to Battery.
6. Plug in and power on your computer to charge your Apple Watch."

Let us know if you have further questions.

Take care.