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Re: Objective measures for battery-friendly vs unfriendly practices?

Posted: Sat Jul 21, 2018 3:15 pm
by be236
There's another thread similar to this one...

The question there is: Is it better to do one long charge to get to say 90% ... or multiple smaller charges to get to 90% battery?

Or put another way , is it bad to do many charges vs few charges?

Re: Objective measures for battery-friendly vs unfriendly practices?

Posted: Fri Sep 21, 2018 10:28 am
by ldallan
be236 wrote:The question there is: Is it better to do one long charge to get to say 90% ... or multiple smaller charges to get to 90% battery?

Or put another way , is it bad to do many charges vs few charges?
IIRC, Nissan advises avoiding charging if the battery is already at 70% or so. Obviously, if you've got to drive 70+ miles the next day, "charge away".

For my "use pattern", 70% is usually plenty for the next day. YMMV ...

Are you asking about doing several short'ish charges per day? Or nightly such as an average of 6 to 7 per week?

Bad? Perhaps "non-ideal" unless you are really into baby'ing your battery.

For us, there was a non-trivial, but interesting "learning curve" to the Leaf. Our nickname for it is "The Town Car". ;-)

Re: Objective measures for battery-friendly vs unfriendly practices?

Posted: Fri Nov 02, 2018 8:00 pm
by tesleaf
ldallan wrote:

Contrasting to the above "best practices" to "non-optimal practices" that I've read on this and other forums:
* charging to 100%
* using DCFC fast charging
* freeway speeds in high heat like Texas or Arizona summers
* draining battery down to LBW, VLBW, or Turtle
Well my Leaf has been through at least 3 of the above.

The first day I was bringing home the used 2015 Leaf, I let the battery go down to 13% and Low batter warning came on around 15%, IIRC.
That night I charged it to 100%.

A couple days ago I bought Leaf spy and found out that the previous owner has used QC over 800 times.

This car was originally from SF, CA. So I doubt it has seen Arizona like summers.

Re: Objective measures for battery-friendly vs unfriendly practices?

Posted: Thu Nov 22, 2018 4:15 am
by shroud
ldallan wrote:* always use Level-2 6.6 kWh charging (220v - 240v) going from 20% to 80%
* never use DCFC (DC fast charging)
* never allow battery SOC to go under 20% (don't drain to LBW low battery warning or VLBW very low battery warning or "Turtle" or 0%)
* mild temperature like San Francisco or Ireland that don't get all that cold or that hot (mostly between 40°F to 80°F)

Contrasting to the above "best practices" to "non-optimal practices" that I've read on this and other forums:
* charging to 100%
* using DCFC fast charging
* freeway speeds in high heat like Texas or Arizona summers
* draining battery down to LBW, VLBW, or Turtle
We have owned our Leaf 2015 only for a bit over two months now, so I am still quite clueless about how to best take care of its battery to make it last as long as possible... it doesn't seem easy to find solid evidence on which charging practices are good/bad in terms of battery degradation.

In these couple of months I have used the CHAdeMO quick charging only once, the day I bought the car because I had to travel 80km on the highway (80-100 km/h) from the previous owner's city to ours, and the trip ended up using about 65% of battery charge. LeafSpy showed that the car had had 52 quick charges, and about 1100 T1/T2 charges.

Since that day, I've only slow-charged it from the home socket. I use only about 20% of battery charge on a regular working day (about 25-30km trip) so in the first weeks I basically charged it twice a week, plugging it whenever I went down to close to 20% and then charge it 4-5 hours up to around 80%. Then I noticed that the EVSE plug was getting quite hot, and changed my charging habits to 1-2 hours (almost) every day. Is this any good or bad?

A few fumbles I'm guilty on:
- I have this US EVSE that is not supposed to be used at 240V European voltage, I am looking forward to buying a proper EU-compliant EVSE; I don't think this has an effect on battery degradation, but there is a risk of hazard (although it's been used for 1-2 years by the previous owner)
- one day I totally forgot to unplug it :roll: so it reached 100%; eventually I drove it the next morning but it stayed at 100% during the whole night
- twice I got lost (thank GPS) while the charge was already quite low, and by the time I got home I was in LBW state, but never got to VLBW or Turtle

We live in a very cold country (Finland), and we're scared to venture farther than 50km from our town until spring. When the really cold weeks come, I am planning to just take a bus if the temperature drops below -15C :D

Re: Objective measures for battery-friendly vs unfriendly practices?

Posted: Thu Nov 22, 2018 4:22 am
by LeftieBiker
Your EVSE plug likely gets "quite hot" because it is being used at the wrong voltage. Many of the EVSE's components can handle it fine, but a few can't. You may also have a corroded outlet, with high resistance. Fix it!