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20 watt charger

The A1567 model number is for the iPad Air (2nd Generation). iPad Air 2, for short.

If you do own an iPad Pro, then the same general rules (below) apply, except the original charger is probably larger than 12W.

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20W should be a larger capacity charger than the original iPad Air 2 charger: 12W I think.

It's fine to use a higher wattage charger to charge a smaller device. The device, not the charger, decides the maximum charge rate. As a result, the device may charge slightly faster than with the charger it came with, but not at an unsafe rate.

The opposite is not true. A too small charger will not only charge slower (if at all), but the charger may over heat, fail, or in extreme cases catch fire. The last is more likely with cheap knockoff chargers than with certified brands that have to meet more stringent quality and safety requirements
 
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