1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Is it worse to keep battery full overnight or empty overnight?

Discussion in 'Prime Main Forum (2017-2022)' started by panpaper, Oct 24, 2018.

  1. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    107,571
    48,862
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    The estimate changes more slowly than the actual

    So if you get a cold snap, you might not go as far as the estimate, and vice versa
     
  2. jaqueh

    jaqueh Active Member

    Joined:
    Jul 13, 2013
    341
    199
    0
    Location:
    San Francisco
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Plus
    Tesla’s have much less than 10% battery degradation over tens of thousands of miles. Volts have almost no degradation. I thought Toyota was using a new chemistry too. I really do think thermal management is this car’s pitfall. I won’t make the same mistake again with my next ev.
     
    dubit and bisco like this.
  3. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    107,571
    48,862
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    interesting, i didn't realize that.
     
    jaqueh likes this.
  4. pizzabad

    pizzabad Junior Member

    Joined:
    Mar 10, 2017
    5
    7
    0
    Location:
    France
    Vehicle:
    2017 Prius
    Model:
    N/A
    I will verify next days when full charging.
     
    jaqueh and bisco like this.
  5. HPrimeAdvanced

    HPrimeAdvanced Senior Member

    Joined:
    Mar 2, 2017
    2,301
    3,517
    0
    Location:
    Anaheim, CA
    Vehicle:
    2017 Prius Prime
    Model:
    Plug-in Advanced
    I'm just about at 30,000 miles on my 2017 Prime Advanced and have seen NO degradation in range at all. It's all about temperature, and how you drive. I am in hot Anaheim California and recharge the battery daily as much as 4 times. I think like my buddy says, "Use it or Lose it! " This seems to be true for cars in general. The amazing thing with the Prii that I've owned, both plugins, there's very little maintenance at all. Just keep driving 'em
    and watch out for nails!!

    Posted via the PriusChat mobile app.
    AChoiredTaste.com
     
    jerrymildred, walterm, benagi and 3 others like this.
  6. jaqueh

    jaqueh Active Member

    Joined:
    Jul 13, 2013
    341
    199
    0
    Location:
    San Francisco
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Plus
    Are you still able to put in about 6kwh?

    I thought about it a bit more yesterday and think it could also be because I rarely charge my battery. I did notice the battery degradation this summer when I was charging in nearly 100° heat.

    So who knows. All I do know is Toyota won’t bat an eye.
     
    bisco likes this.
  7. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    107,571
    48,862
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    You got that right
     
  8. HPrimeAdvanced

    HPrimeAdvanced Senior Member

    Joined:
    Mar 2, 2017
    2,301
    3,517
    0
    Location:
    Anaheim, CA
    Vehicle:
    2017 Prius Prime
    Model:
    Plug-in Advanced
    Hi jaqueh,
    I have never monitored the number of kWhs that I put in; my home charger doesn't have a meter. I do know that over time, depending on my driving style and/or the temperature (including whether I use A/C or not; you NEVER need heat in Anaheim in the 4.5 years I've lived here), my EV range varies between 32 miles and 34 miles. Going up any kind of grade (rare where I drive) greatly affects range. Going up to Lake Forest Sportspark from Anaheim eats up an additional 8 miles+ to go up approximately 800 feet; you do get some of it back coming back down. I drive those trips EXTREMELY RIDICULOUSLY slowly, as much as 15 miles below the speed limit because, on Sunday mornings, those streets are empty. I do keep my Advanced in EV/POWER mode 99% of the time. The car runs great this way, and I love the lightning response of the throttle. On the rare occasions when I've had the gas engine running and/or the car in ECO mode, the car ran like a stuck pig; not at all impressive. Of course I come from an Alfa Romeo, and Type R background, so the Prime electric mode does it for me!



    Posted via the PriusChat mobile app.
    AChoiredTaste.com
     
    Mark57 likes this.
  9. HPrimeAdvanced

    HPrimeAdvanced Senior Member

    Joined:
    Mar 2, 2017
    2,301
    3,517
    0
    Location:
    Anaheim, CA
    Vehicle:
    2017 Prius Prime
    Model:
    Plug-in Advanced
    Oh, be nice!! For as big as it is, Toyota does ok.
    Try calling AT&T, Spectrum, Social Security, my surgeon, my web service, Microsoft, Norton Antivirus, etc. Now THERE you have some TRULY crappy service! Ask THEM to fix something!!! Their Do Do bird (rare, and not too bright) employees are frquently difficult to understand, take forever to answer the phone, and generally are as dumb as mayonnaise! Thank Corporate America for that one.

    Posted via the PriusChat mobile app.
    AChoiredTaste.com
     
    heiwa, Mark57, benagi and 1 other person like this.
  10. jaqueh

    jaqueh Active Member

    Joined:
    Jul 13, 2013
    341
    199
    0
    Location:
    San Francisco
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Plus
    Charged my car from empty a bit today. Got 3.75kwh for 77%. Which means my battery can’t even take 5kwh anymore.
     
  11. pizzabad

    pizzabad Junior Member

    Joined:
    Mar 10, 2017
    5
    7
    0
    Location:
    France
    Vehicle:
    2017 Prius
    Model:
    N/A
    Hello,
    Yesterday I’ve charged fully my battery.

    This is the situation :
    IMG_5702.jpg

    - Amperage : 15,5 A
    - voltage : 227 V
    - Fréquence : 50 Hz

    That’s the results :
    - Power in beginning : 3520 W
    And 5,68 kWh used to this full charge. At the end, the SoC is near 83%.

    IMG_5701.jpg

    The temperatures are near 5 degrees. I can drive in EV mode near 40-45 km per day.
    This summer, it was near 55-60 km.
     
  12. maiki

    maiki Member

    Joined:
    Jul 5, 2018
    103
    16
    0
    Location:
    California
    Vehicle:
    2012 Prius
    Model:
    Three
    I don't understand. Why is it bad to leave it at 100% overnight?
     
  13. axle2152

    axle2152 Active Member

    Joined:
    May 14, 2013
    266
    209
    0
    Location:
    Atlanta, GA
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Plus
    Just to clear a few things up. Shouldn't be a problem overnight. It might be questionable to leave it charged up for long periods of time (say more than a week?), especially in hot weather. Seems lithium ion batteries are kind of like the 3 bears and their porridge...there's an optimal range for performance and longevity.

    Next, there is only one traction battery (HV battery) in the Prime, there is not a 2nd battery for hybrid mode. Just to eliminate any possibility of confusion.

    There is the 8.79 kWh battery for EV and HV driving and your regular 12 V lead acid battery.
     
    HPrimeAdvanced likes this.
  14. ed4271

    ed4271 Member

    Joined:
    Mar 4, 2017
    107
    64
    0
    Location:
    US
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    I charge my car every time I come home. I use the charging cable that came with the car. I haven't had a problem with battery degradation and and I had the car since 2017. I get more mileage in the summertime of course then than the winter time because I live in a cold area. One thing you have to remember about the batteries. There is no such thing as over charging the battery what I mean is that when it says 100% is basically only 80%. In the winter time you should put the car on charge. The reason being is that the battery is warm at that time and because of the chemistry of the battery it allows it to take a better charge then if the battery was cold. You'll get less of a charge when a battery is cold. It's physics. In conclusion I found out it doesn't matter whether you schedule charge or charge it at home and keep it a full charge it only charges up to 80%. Except for in the winter time where you don't get that much of a charge. That is the reason why the car says the battery heater be used for the hybrid system.. There's a reason for that in order for the battery to get a good charge it needs to be warmed. I believe Toyota says that you should just always keep it charged.

    Posted via the PriusChat mobile app.
     
  15. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    107,571
    48,862
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    you do realize that the owners manual says not to leave it fully charged for long periods of time?
     
  16. Tideland Prius

    Tideland Prius Moderator of the North
    Staff Member

    Joined:
    Oct 2, 2004
    44,767
    16,014
    41
    Location:
    Canada
    Vehicle:
    Other Non-Hybrid
    Model:
    N/A
    ^ Someone actually read the manual! :notworthy:
     
  17. jaqueh

    jaqueh Active Member

    Joined:
    Jul 13, 2013
    341
    199
    0
    Location:
    San Francisco
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Plus
    There’s a lot of anecdotal “my battery range hasn’t gone down at all because my miles are the same” in this thread. Has anyone actually calculated about how many kWh their battery is able to take now? Just read pizzas post and their range is similar to mine. So is the range of this battery 6 or 5.5?
     
  18. markabele

    markabele owner of PiP, then Leaf, then Model 3

    Joined:
    Mar 27, 2012
    5,084
    1,782
    1
    Location:
    Nebraska
    Vehicle:
    2018 Tesla Model 3
    Model:
    N/A
    I think this thread needs a little battery fact instead of anecdotal evidence or what they think they did or did not read in the manual.

    Li-ion batteries don't like to be kept at 100%. They don't like to be kept at 0%. Doing so for long periods of time will degrade the battery prematurely. That is fact. They like to be kept fairly close to the middle. Those are about the only binary "fact" statements one can make in terms of Li-ion batteries. Oh, and they don't like being too hot, or too cold.
    Everything in the middle of those binary facts are simply a scale (generally). Is it better to keep the battery at 90% or 80% for a long time? What about 10% or 20%? (these are rhetorical questions)
    Luckily Toyota doesn't let the battery get higher than about 85% or lower than about 20%. Keeping your battery there for long periods of time is much better than 0% or 100%, but is it as good as 50%? (another rhetorical question)
    People need to weigh these facts with what works best for them and their lifestyle/driving habits.
     
    heiwa, HPrimeAdvanced and jaqueh like this.
  19. My first EV

    My first EV Junior Member

    Joined:
    Nov 4, 2018
    38
    16
    0
    Location:
    Canada
    Vehicle:
    2018 Prius Prime
    Model:
    Base
    I have a different question: if my battery is empty, will there be a chance the car can’t start? I mean, when I pushed the start button, it won’t start?

    I mostly rely on public charging stations, but tonight They were all occupied, so I drove home. Hopefully it will start up ok tomorrow ?
     
  20. My first EV

    My first EV Junior Member

    Joined:
    Nov 4, 2018
    38
    16
    0
    Location:
    Canada
    Vehicle:
    2018 Prius Prime
    Model:
    Base
    Oh, I found out the 12Volt battery is the one to start the car, so I should be ok!
    (Feeling dumb, embarrass here ☹️
     
    HPrimeAdvanced and bisco like this.