article
[a330:batteries]

Batteries

There are 2 main batteries each with a normal capacity of 37 ampere-hours (Ah). The APU battery is also 37 Ah. A minimum of 25.5V is required, otherwise the batteries must be charged from external power. Battery voltage can be checked from the overhead panel when the batteries are switched off (the battery voltage is directly wired to the batteries and so is always available). The average charging cycle is approximately 20 minutes.

The DC BAT bus is 28V, and charging of the batteries starts at 26.5V.

The DC BAT bus (powered by DC 1) charges BAT 1 and BAT 2, and the DC APU bus charges APU BAT. Once charging is complete, the lines connecting the batteries to the DC BAT bus on the ECAM ELEC DC page are removed.

The batteries provide approximately 30 mins flight time if powering the electrical system.