Consider installing one of these to monitor your 12V battery; https://antigravitybatteries.com/products/accessories/battery/chargers/bluetooth-tracker-lead-acid/
I can periodically check my Leaf's, parked on the street about 25' away, battery voltage & state of charge from my house.
I can periodically check my Leaf's, parked on the street about 25' away, battery voltage & state of charge from my house.