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You should not use a charger with a significantly higher output current that the one that came with your device. Most chargers are in the 0.5-1A range, and most devices will happily charge at that range. Devices with high batteries, usually tablets and some newer phones, come with 2A chargers to shorten the recharge time, but it is not safe to use those chargers with devices designed to charge at lower current ratings. Some chargers may not work with any device other than the one they came with - the nook tablets have some special connectors if I recall correctly, meaning that they will only charge at fast rate using their own charger.
You should be able to use your 0.7A and 0.8A charger on all devices, but the 2A should be reserved for the device it came with.
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