Electric tool powered by a plurality of battery packs and adapter therefor

A leaf blower comprising:

• an electric motor,
• a main body accommodating the electric motor and configured to propel air out of a nozzle attached to a front portion of the main body;
• a first battery interface integrally formed on a lower surface of a rear portion of the main body, configured to detachably attach a first battery pack and comprising a first positive battery electrode input terminal and a first negative electrode input terminal;
• a second battery pack interface integrally formed on the lower surface of the rear portion of the main body, configured to detachably attach a second battery pack and comprising a second positive battery electrode input terminal and a second negative battery electrode input terminal, the first negative battery electrode input terminal being electrically connected in series with the second positive battery electrode input terminal, wherein the first positive battery electrode input terminal is electrically connectable with the second negative battery electrode input terminal via the electric motor;
• and
• a grip having a front end connected to an upper surface of a front portion of the main body and a rear end connected to an upper surface of the rear portion of the main body, the grip extending from the front end of the main body to the rear end of the main body such that the upper surface of the main body and the grip together form a loop;
• wherein the first battery pack comprises a first movable latch configured to engage a corresponding engagement structure defined on or near the first battery interface, and
• the second battery pack comprises a second movable latch configured to engage a corresponding engagement structure defined on or near the second battery interface.

A leaf blower comprising:

• an electric motor,
• a blower fan configured to be driven by the electric motor,
• a main body accommodating the electric motor and the blower fan, the main body being configured to propel air from the blower fan out of a nozzle attached to a front portion of the main body;
• a first battery interface integrally formed on a rear portion of the main body and comprising a first positive battery electrode input terminal and a first negative electrode input terminal;
• a second battery interface integrally formed on a rear portion of the main body side-by-side with the first battery interface and comprising a second positive battery electrode input terminal and a second negative battery electrode input terminal, the first negative battery electrode input terminal being electrically connected in series with the second positive battery electrode input terminal, wherein the first positive battery electrode input terminal is electrically connectable with the second negative battery electrode input terminal via the electric motor;
• a first battery pack that is attachable to the first battery interface by sliding the first battery pack in a direction from the rear portion of the main body towards the front portion of the main body, the first battery pack having a first movable latch configured to engage the first battery interface to detachably retain the first battery pack on the first battery interface;
• a second battery pack that is attachable to the second battery interface by sliding the second battery pack in a direction from the rear portion of the main body towards the front portion of the main body, the second battery pack having a second movable latch configured to engage the second battery interface to detachably retain the first battery pack on the first battery interface;
• wherein:
• a first plurality of indicators is disposed on a surface of the first battery pack that faces rearward when the first battery pack is attached to the first battery interface, the first plurality of indicators being configured to indicate at least two levels of the state of charge of the first battery pack;
• a second plurality of indicators is disposed on a surface of the second battery pack that faces rearward when the second battery pack is attached to the second battery interface, the second plurality of indicators being configured to indicate at least two levels of the state of charge of the second battery pack;
• and
• the first and second plurality of indicators are arranged so as to be simultaneously viewable in at least one direction in a state in which the first and second battery packs are attached to the first and second battery interfaces, respectively.