Quote:
Originally Posted by dwig
Some devices, rather few these days, do rely on the charger to be the limiting device. These will consume whatever amperage the charger allows and when used with a charger that offers higher current levels will "over eat", which can damage the device. Most devices have their own current limiters and will only draw the amount of current that they were designed for regardless of the charger's capacity.
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Also, in the past, it could be very dangerous to use a charger that offered not enough power. The charger would overheat. Nowadays, a lot of devices measure the power coming from the charger as soon as you plug it in, and refuse to recharge if the power is not enough. Windows Phone 8.x and higher actually displays a warning on the screen that the device won't recharge because the charger is underpowered.