Nissan LEAF 2023 Owners Manual
3.2.2. Charging the 12-volt battery
The 12-volt battery is charged automatically using electricity stored in the Li-ion battery.
When the 12-volt battery is being charged, the charge status indicator light on the instrument panel flashes (except when charging the Li-ion battery or when the power switch is in the READY to drive position). See
.Owners Manual