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Battery locations

 Battery locations

An aircraft is fitted with one or two main batteries depending on its size and role. The battery is located as close as possible to its point of distribution; this is to reduce IR losses through heavy-duty cables. In

smaller general aviation (GA) aircraft, the battery can be located in the engine compartment, alternatively behind the luggage compartment in the rear fuselage.


On some larger GA aircraft the battery is located in the leading edge of the wing, see. Other locations include the nose equipment bay on medium-size helicopters or attached to the external airframe.

  For larger aircraft, e.g. the Boeing 747, one battery is located in the flight compartment; the other

is located in the auxiliary power unit (APU) bay at the rear of the aircraft.

 Batteries are installed in a dedicated box or compartment designed to retain it in position and provide ventilation. The battery compartment is usually fitted with a tray to collect any spilled electrolyte and protect the airframe.

 Tray material will be resistant to corrosion and non-absorbent. The structure around the battery compartment will be treated to reduce any damage from corrosion resulting from any spilled electrolyte or fumes given off during charging. Batteries must be secured to prevent them from becoming detached during aircraft maneuvers; they are a fire risk if they become detached from their tray.

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