shroud
Posts: 18
Joined: Wed Oct 10, 2018 1:27 am
Delivery Date: 15 Sep 2018

Mileage estimation in low battery charge

Mon Nov 12, 2018 12:15 am

Hello,

we've had our Leaf 2015 for a couple of months now, and while I normally keep it charged in the 20-90% range, it just happened to me twice that I drove it below 17% when the SOC percentage indicator disappears and just says "low battery".

I am not completely sure, but I think I noticed that when I enter the "low battery" state, the mileage indicator is not updated anymore. The last time I tried to pay attention, and as soon as the battery SOC % disappeared and "low battery" was displayed, my mileage estimation indicator said 24km. I then drove at least 3-4km more before reaching home, and did not see the mileage estimation update... until the very end when it actually updated to 25km, so +1km!

I know that in general the mileage indicator provides an estimation, but can someone confirm whether in "low battery" condition the mileage indicator is actually completely useless? Considering that this is the time when you might be looking for a charging station asap, I would say that it is also the time when at least a reasonable estimation of the range left is most useful...

Thanks!

LeftieBiker
Moderator
Posts: 13430
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: Mileage estimation in low battery charge

Mon Nov 12, 2018 12:34 am

There are two low battery warnings, not one. The first, "Low Battery Warning," (LBW) typically comes on at 18-19%, and with that one the range estimator keeps working. The second warning, "Very Low Battery Warning" (VLBW) comes on at roughly 10% charge, and shortly afterwards the range estimator stops working, with the estimate replaced by "---". AFAIK the estimate keeps updating until it vanishes. I think that what you are seeing is the estimate going up slightly, because of your slowing down as the result of the warning(s).
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cwerdna
Posts: 9807
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: Mileage estimation in low battery charge

Mon Nov 12, 2018 12:44 am

Also, at some point after VLBW, the % SoC value will go from some whole # (like 6% to ---%).

IIRC, once you hit VLBW, the guess-o-meter (GOM) aka the silly stupid number on the right side will turn to --- miles or km.

http://www.mynissanleaf.com/viewtopic.php?f=31&t=17895 was what I observed when I had a 12 bar '13 in 2014, prior to having Leaf Spy.
shroud wrote:I know that in general the mileage indicator provides an estimation, but can someone confirm whether in "low battery" condition the mileage indicator is actually completely useless?
The GOM is crap as it is. It's totally useless when the GOM turns to --- miles or km.

If you want more visibility, esp. once the % SoC value turns to ---%, then you should use Leaf Spy. Leaf Spy also has as smarter GOM.

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