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A two year old thread? Look at it this way. You need to eat 50 peas to satisfy your hunger for peas. If there are only 25 peas on your plate then you will go away hungry but if there are 75 peas you can easily leave the last 25 on the plate. It is the same with current (amps). If the power supply has more than is needed the device will take what it needs and leave the rest. If a power supply only offers less it will take two course of action. Which one depends on the device.
Course one. the device will throttle down its need in a tradeoff of time vs. current. Taking 500mA for 2 hours is the same as 1000mA for one hour. This sort of thing is what happens when you plug into a computer where the device can easily tell it is a computer because it tries to communicate with the device.
Course two.The device will try and get what it needs anyway and the power supply will overheat and likely stop working at all.
So, having a too small charger is bad but having a bigger than necessary doesn't hurt anything except it is likely more expensive and larger.
Dale
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