Why this answer matters
Using an older 25W or 45W adapter can still charge the phone but will not reproduce Samsung's 60W-class fast-charge result.
2 requirements3 verification steps1 primary source
Requirements
What has to be true
- Compatible USB-C power adapter and cable that support the required Samsung/USB PD charging profile.
- Phone and battery temperature within normal fast-charge range.
Verify it yourself
Use this test sequence
Change one variable at a time so you know which requirement made the difference.
- 1
Check the charger's supported output profiles.
- 2
Use a known-good high-power USB-C cable.
- 3
Compare charging over the same starting battery range rather than judging a short session near full charge.
Limits
What this answer does not prove
- 60W is the supported charging power class, not a guarantee of constant 60W draw.
- Thermal management and battery state reduce charge power during a session.
Relevant DeviceOK checks
Test the part you can observe
Charger Wattage MatchCompare a device's entered power requirement with a charger's rated wattage while keeping USB-PD/PPS and voltage-profile limits explicit.
→USB-C Cable Power Rating CheckCompare an entered cable wattage rating with the power you want to carry, while keeping protocol/e-marker limits explicit.
→Battery Charge Time CalculatorEstimate battery charging time from energy capacity, charger power and entered charging efficiency.
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