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You can't damage your device both charger have an output voltage of 5.0 V.
The amperage limit the capacity (delay) of charge for the device. There is one risk if you choose a too low amperage, not for the device but for the charger. The charger can overheat and this could be a reason of a fire : it's an exetreme case ;-) Even if you have a charger with 5.0 V and 10 000 A you could use a such charger without any risk.
The question is : what the amperage needed by the T68 ? If it's more than 0.7 A, you must not use the 5.0 V / 0.7 A charger.
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