The present invention discloses a policy control method and system, and a relevant apparatus. The battery charger also includes multiple modes for each channel for charging a battery with a continuous current or a pulse current. The angle pins have printed circuit board-side soldered ends and patch plug-side plugged ends. Finally, kits for use in practicing the subject methods are provided. One or more of the passivation layers can be removed using the interfaces between the layers as an etch stop so that the distance between the gate terminal and the semiconductor device layers can be tightly controlled, where the distance can be made very thin to increase device performance and reduce gate current leakage.