Use of any charger not approved specifically by Zebra for use with its batteries could cause damage to the battery pack or the printer and will void the warranty.
Charger Safety
Use care in locating either the single Charger or the Quad Charger. Do not block the ventilating slots on the top and bottom covers. Ensure that the Charger is plugged into a power source which won’t accidently be turned off if you will be charging batteries overnight.
Do not place the Quad Charger in locations where liquids or metallic objects may be dropped into the charging bays.
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QL Series User Guide