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557 - ATPL - If one of the 12 cells of a Lead-acid battery has a broken connection rendering it inoperable, the battery:

Question 557 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Has 1/12 less voltage, but can still be used.
Has 1/12 less capacity, but can still be used.
Has 1/12 less voltage and less capacity, but can still be used.
Is unserviceable.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license