Can affect full EVs also.
The 12v battery runs the usual electronic systems and is recharged by the 400+V traction battery when ignition is turned on for most cars.
The self-discharge rate for Li-ion is virtually nil but some EVs have passive systems (Tesla when "sentry mode*" activated for example) that draw a few kWh per day and can lead to the big battery running down.
* 24/7 360° camera recording - especially useful in the US where morons seem to target EVs as "un-American"
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