Why would a car battery go out if the car hasn’t been used for a long time?
In: Engineering
A car battery sitting on a shelf will have its own slow rate of self-discharge, unavoidably, due to the internal chemistry.
Separate from that:
Modern cars require a steady small battery current at all times, for its computer, for preserving the radio settings, for anti-theft systems, and so on. Some cars activate separate electric motors and sensors, hours after the owner exits, as part of their emissions system tests.
If cars aren’t driven for many weeks, these small currents add up to a major total current drain, leaving batteries in a discharged state.
(So, if owners can’t drive their cars every week, and if they park in a garage, they should invest in a modern microcontroller-based battery charger/maintainer, to preserve their battery health)
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