4. Battery holder and battery chamber （电池座和电池室）

(1)Design a battery chamber which the electric is not connected when a battery was reversed. Describe the correct loading direction of battery surely and indelibly on a battery chamber.

  （设计电池室以防因电池颠倒而引起的电流不通。描绘电池正确的加载方向于电池室里，确保其无疑并不可磨灭）

(2)Design a battery chamber which other size batteries can not be inserted or connected.

         （设计的电池室应无法嵌入或连接其它不同型号的电池）

(3)Design a battery chamber which is outgassed easily. （设计的电池室应易通气）

(4)Design a battery chamber preventing water entering.（设计的电池室应防水）

(5)Add the feature of explosion protection to a battery chamber when it is sealed.

         （电池室密封时应增加防爆功能的装置）

(6)Set a battery chamber apart from heat source equipment.

          （设计的电池室应远离热源设备）

(7)Design a battery chamber which children can not pull out easily.

          （设计的电池室小孩应不易拔出）

5. Interface and terminal （交界面和接线端）

(1)Make sufficient quality and shape for electric connection.

  （为电连接确保足够的质量和形状）

(2)Design an attached circuit which prevents the batteries reversed.

         （设计附属电路以防电池颠倒）

(3)Shape the battery preventing from being reversed.（设计电池形状以防其被颠倒）

(4)Do not solder or weld to batteries directly.（切勿直接焊接电池）