How do I know if my phone battery needs replacing?

Concerns & risks

You were trying to figure out why your phone dies so quickly, and you wonder if the battery is just worn out.

A worn battery causes shutdowns and short life.

Causes & evidence

iPhones show Battery Health in settings; other phones may have similar tools. See phone battery care.

What to do

1. Check Settings > Battery > Battery Health (iPhone).
2. Look for unexpected shutdowns.
3. Get service from authorized providers.

Common mistakes: Common mistakes: buying cheap replacement batteries from unknown sources. Use authorized repair services. Watch for swelling, which can push the screen up; stop using and charging the phone and get it serviced. Back up before battery service. Check if your phone is under warranty. Many phones show battery health or a 'service' message in battery settings. If the phone shuts off at 20% or 30%, or the battery drains much faster than it used to with the same use, it may be time for a replacement. Battery replacement usually costs much less than a new phone.

Speed Man tip: Swelling batteries need immediate service.

Wrap-up: Check health. Watch for shutdowns. Authorized service.