Battery pack, battery charger and an electronic device using a battery pack

A battery charger for charging a battery pack comprising:

• a battery pack securing section for securing a battery pack having at least two cells accommodated therein;
• engaging means for engaging the battery pack having at least two cells accommodated therein with the battery pack securing section wherein said engaging means includes engaging members arranged in at least two parallel sets for engagement with the battery pack;
• connecting means connected to a positive electrode terminal and a negative electrode terminal provided in a bottom region of the battery pack having at least two cell accommodated therein and being disposed at such a position that charging or discharging can be performed;
• a space between a center of the positive electrode terminal and a center of the negative electrode terminal is less than a width of one of the battery cells, and
• wherein said battery charger has a band-shaped projection which is capable of engaging a channel formed on the bottom region of the battery pack for properly positioning the battery pack in the battery charger.

An electronic device using a battery pack, comprising:

• a battery pack securing section for securing a battery pack having at least two cells accommodated therein;
• engaging means for engaging the battery pack having at least two cells accommodated therein with the battery pack securing section, wherein said engaging means includes engaging members arranged in at least two parallel sets for engagement with the battery pack;
• connecting means connected to a positive electrode terminal and a negative electrode terminal provided in a bottom portion of the battery pack having the at least two cells accommodated therein and being disposed at such a position that charging or discharging can be performed;
• a space between a center of the positive electrode terminal and a center of the negative electrode terminal is less than a width of one of the battery cells, and
• wherein said battery charger has a band-shaped projection which is capable of engaging a channel formed on the bottom region of the electronic device for properly positioning the battery pack in the electronic device.