How to Fix Galaxy S25 Charging Slow After Update

If your Galaxy S25 started charging slowly right after an update, the problem is usually tied to background optimization, a charging setting that changed, heat protection, cable or adapter negotiation, or a software bug affecting fast charging.

Use these exact fixes to restore normal charging speed on the Galaxy S25, Galaxy S25+, and Galaxy S25 Ultra.

Fix #1: Confirm Fast Charging is still enabled

Go to Settings > Battery > Charging settings and make sure Fast charging is turned on. Some updates reset charging-related preferences or switch them off during optimization.

Fix #2: Restart the phone before charging again

A reboot clears background services that may be stuck after the update. This can immediately restore proper power negotiation with your charger.

Fix #3: Use the original Samsung cable and power adapter

Slow charging often happens when the phone falls back to basic charging speeds because the cable, adapter, or USB-C connection is not negotiating fast charging correctly.

Fix #4: Check for overheating while charging

If the Galaxy S25 is warm, the system may reduce charging speed to protect the battery. Remove thick cases, stop gaming or video streaming, and charge in a cooler room.

Fix #5: Turn off Battery Protection for testing

Open Settings > Battery and temporarily disable battery protection features to see whether the new update changed charging behavior at certain percentages.

Fix #6: Clean the USB-C port

Lint or debris inside the charging port can cause unstable contact and make the phone charge slowly or repeatedly reconnect.

Fix #7: Charge in Safe Mode

If charging speed improves in Safe Mode, a third-party app is likely keeping the phone active, generating heat, or interfering with power management after the update.

Fix #8: Install the next Samsung patch

If slow charging started only after a firmware update, check for a newer build. Samsung often fixes charging, thermal, and battery bugs in follow-up patches.

Related Galaxy S25 fixes

If your Galaxy S25 is still charging slowly after trying a different charger and disabling heat-related limits, test wireless charging and inspect the USB-C port for damage.