Is it normal for range to drop overnight when the car isn't even plugged in?
One month in with my first EV (a Bolt EUV, if that matters) and there's a handful of little things throwing me off that nobody mentioned before I bought it. The charge percentage keeps ticking down a point or two some mornings even though I never touched it overnight — didn't drive it, didn't precondition, just parked it in my own driveway. First time I saw that I thought something was actually wrong. The range number on the dash also doesn't seem to match reality half the time — some days it's way more generous than what I actually get, other days less, and I can't tell if that's normal or if my car has an issue. And I was not ready for how hard this thing takes off from a stop — my foot barely moved and I about hit my head on the headrest. Is all of this just what month one looks like, or should I actually be worried about any of it?
Filed under: General EV Talk
27
14 answers
14 ANSWERS
@icewardenJuly 22, 2026
Eight years in, all three of those are just month one. The percent or two overnight with nothing running is normal — parked and unplugged doesn't mean zero draw, the car still checks on itself. Nothing to fix. The range number gets more honest the more you drive it — it's averaging your last several trips, so in week one it's still guessing off factory defaults, not your actual driving. Give it four to six weeks before you trust it either direction. And the takeoff — yes, that's just what an electric motor does with no gears to soften it. You'll stop flinching by week three. Bigger thing nobody warned me about back then: budget for one public charger out of every four or five being broken, occupied, or just offline when the app says otherwise.
Logged mine since day one — averages almost exactly 3% a week sitting in a sealed garage, nothing plugged in wrong, nothing running. Consistent enough across four months now that I stopped treating it as a mystery. If yours is losing more than that weekly with nothing plugged in, that's worth actually checking, not just shrugging off.
Worth being precise about what's actually happening: the battery management system wakes up periodically on its own to check cell balance and hold pack temperature, and that's most of what people call phantom drain. Not a leak in any meaningful sense. Two to five percent a week at rest is a normal range depending on climate and how aggressive your specific car's standby settings are — outside that range is when it's worth asking a dealer about it.
@twigcoralJuly 22, 2026
Does the percentage that ticks down overnight while it's unplugged actually come out of real usable range, or is some of that just the display recalibrating?
Does the hard takeoff feeling ease up once you're used to one-pedal driving, or does it always launch like that from a dead stop?
@crookedpixelJuly 22, 2026
Bigger surprise than the car itself honestly. Budget for one broken, one occupied, or one just quietly offline out of every four or five stops on a normal week, not just road trips. The app telling you it's available means less than you'd think.
Same math, worse story — three dead stations on one trip, all three showing green on the app when I pulled up. Called it in each time, got the same 'known issue, working on it' response. The gap between what the app says and what's actually there is bigger than anyone tells you starting out.
Worth flagging for anyone charging at a shared apartment spot or curbside charger: delivery vans and random cars unplugging you to grab the spot happens a lot more in month one than people expect, mostly because nobody's told you yet that it's normal. It's rarely malicious — whoever did it usually just needed the space and didn't think about what unplugging you meant. Takes a few times before you stop taking it personally and just start checking before you assume you're topped off.
That overnight tick-down without driving or preconditioning is almost always background drain — sentry-type monitoring, cabin/battery thermal checks, cellular polling. A point or two overnight is normal; it's only worth chasing if it's more like 5%+ with everything off. For the range-estimate mismatch, check the battery detail screen for the raw kWh remaining instead of the dash guess-o-meter, which just extrapolates off your recent driving style.
@maplebuttonJuly 22, 2026
Does the overnight percentage drop happen even in warm weather, or is that more of a cold-weather phantom-drain thing? Trying to figure out if it's seasonal or just always there.
Does the dash range estimate usually get more accurate after the first month, or does it stay kind of rough long-term?
@orangeplutoJuly 22, 2026
Add tire noise to the list. Didn't expect it to be that noticeable without an engine covering it up, especially on the highway. Took me a minute to realize nothing was actually wrong.
@nimbus_rookJuly 22, 2026
Regen took me longer to adjust to than anything mechanical. First few weeks I kept braking early out of habit, foot still expecting to coast the way a gas car does. Took about a month before one-pedal driving felt normal instead of like I was doing something wrong.
@marblepigeonJuly 22, 2026
The overnight tick-down when it's unplugged is usually just phantom drain — cabin overheat protection, BMS housekeeping, that kind of thing — a point or two a night on its own isn't degradation. The range estimate mismatch also tends to settle down once the car has more of your actual driving logged to calibrate against.
Delete post?
Once you delete this post, it can't be restored.