The IN1685000 is configured to charge 4S cell lithium ion battery pack safely and accurately. Rated for Class II operation, the 16.8V 5A battery charger requires no earth ground connection. Likes our other charger models, it has been authorized to carry UL mark, comes with a listing number and proved to meet the battery charger standards regarding safety distance, fire hazard, flammability rating, structural integrity, safety interlocks, etc. Based on UL's definitions, the charger with charging function must be evaluated by the applicable UL standard before marking product "Charger". The category of 16.8V 5A battery charger is EPBU, EPBU7: UL 1310 Class 2 Battery Charger applicable UL 1310 standard.