valem
Posts: 44
Joined: Thu Apr 26, 2018 6:24 pm
Delivery Date: 24 Sep 2018
Leaf Number: 405151

Re: Another reason not to charge to 100%

Sat Feb 02, 2019 7:34 pm

Lots of great info in this article for anyone that has not seen it! Enjoy!

http://www.electricvehiclewiki.com/wiki ... city-loss/

"For lithium batteries a lower average SOC (to a point, down to 30% SOC) over time will result in a longer battery life, and a higher average SOC over time will result in a shorter battery life"

"In order to prolong battery life, GM uses just 65% of the Volts battery capacity, setting the limits at about 22% SOC on the low end and 87% SOC on the high end."

"Capacity retention is almost constant below 50% SOC, but decreases with the SOC in the range of 50% to 80%. Batteries should be stored at the optimum storage state of charge which is between 30% and 40%."
2013 Silver SL 35,800 mi
Tinted windows.
Battery replaced 05/15/17 @ 29,677 mi

arnis
Posts: 957
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: Another reason not to charge to 100%

Sun Feb 03, 2019 3:10 am

Yes. Correct.

Leaf's BMS discharges HV battery down to those levels with trickle charging 12V battery and
in case battery heater operates. And then it doesn't activate those functions any more. To keep around 30%.
This might result in frozen battery or dead 12V. But that hardly matters.

Also it appears Audi's e-tron has maximum SOC no more than 90% of "actual" maximum.
This can be estimated because e-tron rapidly charges when vehicle screens show more than 95% state.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

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