arnis wrote:Don't worry.
If it goes bad it goes bad. That happens with all cars.
I'm not sure about "switching OBD dongle off". Just remove it.
you could get a CTEK charger and help the battery live longer without worrying about removing the OBD dongle every night. In my opinion it is a great charger, much better than the Battery Tender which I used to use back when I rode a Honda Rebel 250,
I have the CTEK 0.8, which is $51 at Amazon, or they have the MUS 4.3 for $69, which does everything the CTEK 0.8 does but can also be switched to charge at 4.3 amps instead of the 0.8 amps. In looking back, I think I would have spent the bit extra to get the MUS 4.3. A few other people on the forum here use the CTEK charger too.
One detail though, which the experts can hopefully correct if I'm wrong or confirm if I'm right, is that when charging the 12V battery hook up the + (Positive) lead of the charger to the + (Positive) of the 12V battery, but hook up the - (Negative) lead of the charger to the bolt where the Negative cable from the 12V battery is attached to the inverter and do not use the - (Negative) terminal of the 12V battery itself. I'm not really sure why attaching to the - (Negative) terminal of the 12V battery is so bad, especially if the LEAF is off, but as I understand it the experts do not want it hooked up that way, only to the bolt.