The Razer Nabu X | RZ15-01290 charging cable has been thoroughly tested and is certified safe, if used correctly. Using the charging cable improperly may be hazardous and can also damage the cable and Nabu X. Razer will not be responsible for the use of the charging cable in a manner not advised below.
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If using a third-party USB charger with the Nabu X charging cable, plug the charging cable into the Nabu X unit first before plugging the USB into the charger or turning on the charger.
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Ensure the proper alignment of the charging cable with the Nabu X unit.
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Do not force if the charging cable does not fit snugly (see illustration below).

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Do not slant the charging cable at an angle when inserting it into the Nabu X unit.
Other suggestions:
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Use a safety-certified USB charger or adapter with a current rating of no more than 2A, preferably 500 mA.
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Do not touch the exposed charging pins of the Nabu X charging cable against any metallic surfaces, especially if the other end is plugged into a USB charger that has been turned on.