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01-05-2021, 04:15 AM | #23 | |
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01-05-2021, 04:25 AM | #24 |
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I know for a fact the BMW dealership left the car go flat for 8 months over lockdown in a car park without plugging it in before the sale. I suspect this might have something to do with it!
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01-05-2021, 08:13 AM | #25 |
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The batteries don't go flat, at 0% there is a save charge level still in the battery. However, 8 months is a long time. It won't have helped the battery life. If fully charged before it might have just survived before turning into a brick. Wouldn't have bought it to be honest. 91% still sounds O.K. for the cells. The exposed "window" however should have hidden that from you. 91% visible would be O.K. for a Tesla (they allow full capacity use up to max. Voltage to advertise higher kWh and range). For BMWs more conservative strategy it is a concern.
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01-05-2021, 09:30 AM | #26 | |
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"No. 61 03 98 (387) Battery recharging intervals for stationary vehicles, battery charging calendar and battery hangers (12 V battery, high-voltage battery unit)" Including a "BMW Battery Calendar" for non US models and a "Battery Log Form" for US models. |
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01-07-2021, 07:03 PM | #27 | |
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Interestingly, my 2014 i8 with 70k mi is still at 100%, while the same old i3 with 30k mi is now at 93%.Different types of stress of course. |
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01-11-2021, 03:45 PM | #28 | |
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However leaving a car to go flat over 8 months can't have done it any good. |
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01-18-2021, 07:29 PM | #29 | ||
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01-20-2021, 03:27 AM | #30 |
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It doesn't matter only how fast you charge regarding stress. It matters at which proportion of the capacity per time you charge. For the about 10 kWh of the current i8 battery the about 2,3kW charge is 0,23C. If you have a 100 kWh battery, you can charge at 22kW with the same stress on the battery. 1C is perfectly fine as charging speed. For the 43 kWh i3, 50 kW is just over 1C and no issue. Charging an i8 at 5C (50 kW) or more would. That's also why Tesla doesn't charge at more than 1C at the superchargers anymore for most of the time, no matter what kW they advertise. The Cells can't take it. At the moment, Porsche leads the pack there with what sustained charging speed the cells can take. If they will last we will see...
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01-21-2021, 04:41 PM | #31 |
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01-25-2021, 04:34 AM | #32 |
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Well it does. The i8 charges at max. 60 kW recuperating. That is 6C or something. Just something to be aware of. Taking 10C out of the battery is not an issue, if it isn't too cold. Those BMSes have a lot of parameters to keep in mind
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01-30-2021, 07:29 PM | #33 |
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That isn't sustained though, there is a difference between regen or acceleration for 5-10 seconds versus charging for 30 minutes
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02-01-2021, 06:25 AM | #34 |
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02-01-2021, 05:23 PM | #35 |
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It is really 60kW of regen? That's actually much better than I expected, my dual motor Tesla gets 72kW max regen and it's hard to get a feel for the full regen in the i8, since you have to apply the brakes and can't really feel what is regen or friction braking.
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02-01-2021, 07:40 PM | #36 |
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Speaking of batteries and charge. My 2018 LCI i8 coupe intermittently gives the error ' Drivetrain. No restart'. The associated OBD2 code was 1D3702 Power Management, Battery: Faulty Charge By High-Volt Battery ( among others like Standby Current Violation) Then sometime the error spontaneously disappears and the car drives perfectly and can restart. Pat (Patonlinegarage) ,ever so kindly, suggested I consider the 12v battery . I just did a load test and the battery readings are ok with a state of health at 91%. Can it still be the 12v causing the error if all the measurements during battery testing seem fine? My car was bought in the UK and still under warranty but I shipped it to Trinidad and the local agents refuse to touch it.
Last edited by necropsyblade; 02-01-2021 at 07:45 PM.. Reason: add info |
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