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In meantime to disconnect the battery as proposed by Vincent and add a charger for the 12V Battery longtime storage seams to me the most suitable solution. [JMK2020]
[see Thread: ED Long Term Storage]

Storage for up to 60 days (verified four times by myself):

1. DISconnect negative post, the (-) post, of 12v battery.
2. connect 12v battery to 'float charger" / "trickle charger".
3. when you return home REconnect 12v battery.
4. ED will operate normally with NO error codes or issues.
5. you have saved your high voltage battery from destruction by following this verified procedure, and saved currently $12,500.00US cost of hv battery replacement.
6. over 60 days - I have yet to vacate for this long so far, but maybe soon I will. But ask yourself, why would another month of disconnection make any
difference? When the car has no 12v energy source how can it create mayhem, injury, destruction to the System?
7. Report your findings to the 'Case Studies Needed - ED Long Term Storage' thread.
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Or, you can just disconnect the 12V battery after making sure it is fully charged. A healthy lead-acid battery should not self-discharge much over 60 days. [Yinzer]
Sorry, forgot to repeat that my 12v battery is old and thus needs the float charging while disconnected. Sure, a good 12v battery can sit for a month or three.
Next week taking another trip so Smarty will be on her own once again.
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