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Leaving your i3 plugged in would fully charge the battery pack. Leaving a battery pack at a full charge (~95% of its maximum charge due to an unusable 5%) results in a bit faster cell degradation than if it were left at a lower charge level. The self-discharge rate of the HV battery pack is very low, ~1% per month, so it would be fine at 70%.Your 12 V battery shouldn't discharge in 1 month. Several of us with battery monitors installed have noticed that the DC-DC converter will turn on automatically for an hour when the 12 V battery's voltage drops below a certain level, even without an EVSE being plugged in. This happens repeatedly when the 12 V battery's voltage drops below a certain level. This will discharge your HV battery pack very slightly, but it shouldn't be noticeable. The full capacity of your 12 V battery is only 0.24 kWh compared with the remaining ~20 kWh of capacity of your 94 Ah HV battery pack at a 70% charge level.
Leaving your i3 plugged in would fully charge the battery pack. Leaving a battery pack at a full charge (~95% of its maximum charge due to an unusable 5%) results in a bit faster cell degradation than if it were left at a lower charge level. The self-discharge rate of the HV battery pack is very low, ~1% per month, so it would be fine at 70%.
Your 12 V battery shouldn't discharge in 1 month. Several of us with battery monitors installed have noticed that the DC-DC converter will turn on automatically for an hour when the 12 V battery's voltage drops below a certain level, even without an EVSE being plugged in. This happens repeatedly when the 12 V battery's voltage drops below a certain level. This will discharge your HV battery pack very slightly, but it shouldn't be noticeable. The full capacity of your 12 V battery is only 0.24 kWh compared with the remaining ~20 kWh of capacity of your 94 Ah HV battery pack at a 70% charge level.
