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The Anker 20W Wall Charger is not capable of charging a Samsung Galaxy S series phone at 25W. To achieve 25W charging, your Galaxy S series phone requires a charger that supports the PPS (Programmable Power Supply) charging protocol with appropriate wattage. Since the Anker 20W Wall Charger does not meet these specifications, it cannot provide 25W charging for Galaxy S series phones. Consider using a charger with higher wattage and PPS support, such as the Anker 313 Charger or equivalent models mentioned in the knowledge base.
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