I agree. There should be no issues with any battery as long as your 12 volt battery is in good condition. At one point, I left my 2017 i3 BEV for one week. I knew my 12 volt battery needed to be replaced soon since it was almost 5 years old but but it was currently causing me no issues up until I left my car for one week almost fully charged. When I came back one week later, it was obvious the 12 volt battery was going dead since it was causing all sorts of errors, reduced driving responses, etc. I quickly bought a new 12 volt battery from my local BMW dealership ($199 battery + $400 for installation!) I skipped the installation and installed my new 12 volt battery myself thus saving me $400! Registered the new battery on my Bimmer code and now my i3 runs perfectly again!!For two weeks, it would be better to leave it at (say) 60% charged, than at 100%. My car is often left for up to 2 weeks and I never see more than 1 or 2% loss in HV battery in that time. As long as the 12V battery is in good shape, it will be fine. If you have doubts about the 12V battery (e.g. if it is 5 years old or more) then I would change it for a new one as a precautionary measure.
The displayed charge level is a calculated estimate that can't be directly measured. As a result, it can be a bit inaccurate although the battery management system (BMS) calibrates its estimate when the battery pack voltage reaches the maximum or minimum value allowed by the BMS.Just fyi...I have run my BEV for over approximately (+/-) 10 miles when the battery gauge shows zero battery charge! I'm curious what and/or if there is a "reserve" amount of charge left when it shows zero charge???
For an older i3 that may not be a good idea, because when you have a weaker cell or cells in your pack after many years, those may experience too much undervoltage and you may damage them over time. I am not shure if the bms takes that into account but I try to keep the discharge above 10%, preferably 20%. When my car was newer, I could still drive for a few miles being at zero charge but in the end, only creep mode for a few hundred yards... happened only once and I made it to the charging station. I won't try that now however.I periodically drive down to a displayed 0% charge level to help the BMS calibrate its charge level estimate
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