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by Oleksiy
Sat May 04, 2019 10:40 pm
Forum: Technical BMW i3 Discussions
Topic: Cell balancing
Replies: 6
Views: 415

Re: Cell balancing

Thanks, I may perform the re-initialization, this is why I spend time to install ISTA+ in the first place. Have been researching the downsides for a while before I pull the trigger.
by Oleksiy
Fri May 03, 2019 3:43 am
Forum: Technical BMW i3 Discussions
Topic: Cell balancing
Replies: 6
Views: 415

Re: Cell balancing

Thank you, I stand corrected, it does seem to plummet abruptly closer to zero SOC. Unfortunately, I wasn't able to find any voltage vs. SOC curve, but based on the screenshots borrowed from here https://www.goingelectric.de/forum/viewtopic.php?f=71&t=21752&start=750, this healthier battery displays ...
by Oleksiy
Thu May 02, 2019 4:54 am
Forum: Technical BMW i3 Discussions
Topic: Cell balancing
Replies: 6
Views: 415

Cell balancing

I checked my logs during the extended weekend we had in Ukraine, and it appeared that my last 100% charge took place back in March. And also, I had only five full 100% charges during March as well, with average beginning of day SOC staying at 85% both for March and April. This looked like a perfect ...
by Oleksiy
Wed Apr 24, 2019 10:55 pm
Forum: Technical BMW i3 Discussions
Topic: Converting I3 from US CCS to EU CCS
Replies: 14
Views: 7866

Re: Converting I3 from US CCS to EU CCS

Correct, it should just work. On top of the plug replacement, my OUC was modified to accept 220V instead of 120V, I'm not aware of the technical details though, it's a standard procedure.
by Oleksiy
Wed Apr 03, 2019 11:50 am
Forum: Technical BMW i3 Discussions
Topic: Management of Battery Life
Replies: 16
Views: 1342

Re: Management of Battery Life

Not sure what the specs are on the earlier batteries, but Samsung claims that the 94 Ah i3 battery cells can be charged through 4,600 cycles before degrading to 80% 'end of life' capacity - which if charged every day, that would be about 12.5 years. https://insideevs.com/lets-look-at-the-specs-of-t...
by Oleksiy
Wed Apr 03, 2019 3:59 am
Forum: Technical BMW i3 Discussions
Topic: Management of Battery Life
Replies: 16
Views: 1342

Re: Management of Battery Life

8% lower limit reserve and 6% upper limit reserve, to be exact, in a healthy i3 60Ah battery. Later, once SOH goes down, it's reflected in the upper reserve - it goes down as well, the lower one seems to stay untouched on paper. See my pack's 85.5% SOC upper charge limit on a screenshot below - it r...
by Oleksiy
Tue Apr 02, 2019 12:34 pm
Forum: Technical BMW i3 Discussions
Topic: Management of Battery Life
Replies: 16
Views: 1342

Re: Management of Battery Life

Cycling the battery in the middle, avoiding too high or too low voltage, significantly improves longevity of li-ion batteries. This has been proven by numerous studies. In practice, this is why EVs with larger batteries are less prone to degradation, especially if their owners don’t follow ABC rule....
by Oleksiy
Tue Apr 02, 2019 2:55 am
Forum: Technical BMW i3 Discussions
Topic: Management of Battery Life
Replies: 16
Views: 1342

Re: Management of Battery Life

I'm of the opinion that all this cell balancing thing is overblown. I suspect that cell balancing will become more important as cells age and their internal resistances and capacities diverge. For newer cells, cell balancing is probably not needed as much. This makes sense, I'll keep checking the s...
by Oleksiy
Mon Apr 01, 2019 11:45 am
Forum: Technical BMW i3 Discussions
Topic: Management of Battery Life
Replies: 16
Views: 1342

Re: Management of Battery Life

I charge lower than 100% routinely, checked my battery cell balancing several times using ISTA+ software. No issues - 0.1-0.2V difference between min and max values. Other screenshots of battery voltage page from ISTA+ of other cars on the net show the same. I'm of the opinion that all this cell bal...
by Oleksiy
Thu Mar 21, 2019 1:10 am
Forum: Buying the BMW i3
Topic: Am I reading this range display correctly?
Replies: 3
Views: 370

Re: Am I reading this range display correctly?

Shopping for an i3. Am I right interpreting this as the battery nearly 75% charged and only 32 miles range expected? https://i.imgur.com/FAJ2T9Y.jpg Just skip it and look further. From experience, I wouldn't be able to drive the GOM of my 2015 BEV to go this low even if I drain my full battery at c...

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