Charger and charger system

A charger comprising:

• a housing;
• charger electronics positioned within the housing;
• an interface positioned in a first wall of the housing and configured to engage a battery pack, the interface including charging terminals positioned between a first rail and a second rail, a first groove positioned between the first rail and the first wall of the housing, and a second groove positioned between the second rail and the first wall of the housing, the interface being in communication with an interior of the housing, the charging terminals being in electrical communication with the charger electronics;
• a first fan in communication with the interface, the first fan being positioned between the first wall and the second wall;
• an air passage guide that has a first end and a second end spaced apart from the first end, the first end in communication with the fan and the second end in communication with outside of the housing through through a second wall, the first fan being operable to suck a first air flow into the housing from outside the housing and guide the first air flow through the air passage guide to the interface;
• and
• a second fan positioned within the housing and operable to suck a second air flow into the housing from outside the housing such that the second air flow moves through the housing to cool the charger electronics.

A charger for charging a battery pack having a housing enclosing a plurality of battery cells and one or more vent holes, the charger comprising:

• a housing including a battery pack receiving portion and a separate charger electronics portion, the charger electronics portion including a charger electronics enclosure;
• a battery pack interface supported on the battery pack receiving portion, the battery pack interface including charging terminals;
• a first cooling air passage extending though the battery pack receiving portion;
• a first fan positioned in the battery pack receiving portion and operable to move air from outside of the battery pack receiving portion into the first cooling air passage;
• and
• a printed circuit board including electrical components in electrical communication with the charging terminals, the printed circuit board enclosed within charger electronics enclosure;
• a second cooling air passage extending through the charger electronics portion and being in fluid communication with the charger electronics enclosure for removing heat generated by the electrical components and sealed from the first cooling air passage;
• and
• a second fan positioned in the charger electronics portion outside the charger electronics enclosure and operable to move air from outside charger electronics portion into the second cooling air passage.