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In terms of power, it is perfectly possible for a 10-watt charger to charge a 20-watt electrical device.
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However, we also need to consider two key factors when charging, whether the voltage of the electrical equipment and the output voltage of the charger are consistent, and the current cannot exceed the rated working current.
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That is to say, if the voltage of the charger and the battery of the device is consistent, a 10-watt charger can be used to charge a 20-watt battery
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10 watts can charge 20 watts, but the charging speed has slowed down, or it is not recommended to use 10 watts to charge 20 watts, which will lose.