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by Oleksiy
Wed Apr 03, 2019 11:50 am
Forum: Technical BMW i3 Discussions
Topic: Management of Battery Life
Replies: 16
Views: 845

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: 845

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: 845

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: 845

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: 845

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: 299

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...
by Oleksiy
Tue Mar 12, 2019 2:36 pm
Forum: News and Main BMW i3 Forum Discussions
Topic: 2014 i3 getting only ~40 miles on full charge
Replies: 19
Views: 1812

Re: 2014 i3 getting only ~40 miles on full charge

40 miles range was unrealistically low even for a 14 kWh pack, implying just 2.9 miles/kWh efficiency. I’ve never had anything remotely close to that even under 5F / -15C ambient temperature. With the 16 kWh battery, implied by the test results, your range should be north of 65 miles (EPA range base...
by Oleksiy
Thu Mar 07, 2019 2:08 pm
Forum: News and Main BMW i3 Forum Discussions
Topic: 2014 i3 getting only ~40 miles on full charge
Replies: 19
Views: 1812

Re: 2014 i3 getting only ~40 miles on full charge

There are several threads on the matter here: http://www.mybmwi3.com/forum/viewtopic.php?f=2&t=5519 http://www.mybmwi3.com/forum/viewtopic.php?f=15&t=5541 I may be wrong in my assessment, I'm not from the USA, but my conclusions from reading many similar complaints here and on FB group so far are as...
by Oleksiy
Mon Feb 25, 2019 5:52 am
Forum: Other Electric Vehicles
Topic: New battery tech
Replies: 28
Views: 9830

Re: New battery tech

Flow batteries are starting to show up in the news a bit more lately. If you're not familiar with them, when the battery runs down, you essentially flush out the electrolyte and pump in some new. In theory, it takes about the same time as refilling a typical ICE. Maybe every 30K miles or so, you al...
by Oleksiy
Fri Feb 22, 2019 1:26 am
Forum: News and Main BMW i3 Forum Discussions
Topic: Range reduction in cold weather
Replies: 5
Views: 1206

Re: Range reduction in cold weather

This is what I want to suggest . I think that , perhaps , only the voltage of the battery is being used to calculate the SOC . It seems clear , however , that the temperature of the battery is also a factor in determining how much charge it is holding . The temperature of the battery is available ....

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