Henchman
Posts: 28
Joined: Wed Mar 25, 2015 9:07 pm
Delivery Date: 26 Mar 2015
Leaf Number: 8376

What does the Hx percentage mean?

Sun Apr 05, 2015 10:19 pm

I did my first leaf spy scan today on a full charge on my used 2011 Leaf.
These are the results:

225 GIDs
89.1%
SOC 93.7%
17.4kwh Remain
AHr 53.40
SOH=81%
392.46V
HX= 64.82%
Odo= 19,133 mi

What does this mean in regards to the health of my battery?

jpadc
Posts: 274
Joined: Sat Dec 13, 2014 7:25 am
Delivery Date: 20 Dec 2014
Location: Indiana & Wisconsin

Re: What does the Hx percentage mean?

Sat Apr 11, 2015 8:58 am

I'm surprised one of the more experienced members have not chimed in on this, but those numbers seem from what I've read here pretty typical (maybe a little low) for the age and miles. If you do a search on the forum you will find lots of threads on this.

Here is just one recent one that had a little better numbers with some details about your intended use to know how it will do for you

viewtopic.php?f=23&t=18778
2013 Leaf S /w Charge Package - Purchased new in Iowa City Dec. 2014
My previous car was a 2008 Prius Touring Package 5 - 73k Miles, 43 MPG lifetime

Henchman
Posts: 28
Joined: Wed Mar 25, 2015 9:07 pm
Delivery Date: 26 Mar 2015
Leaf Number: 8376

Re: What does the Hx percentage mean?

Sat Apr 11, 2015 9:11 am

My Hx has already dropped down to 61.44% at 19.5 k miles.

User avatar
RegGuheert
Posts: 6326
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
Location: Northern VA

Re: What does the Hx percentage mean?

Sat Apr 11, 2015 11:03 am

Henchman wrote:I did my first leaf spy scan today on a full charge on my used 2011 Leaf.
These are the results:

225 GIDs
89.1%
SOC 93.7%
17.4kwh Remain
AHr 53.40
SOH=81%
392.46V
HX= 64.82%
Odo= 19,133 mi

What does this mean in regards to the health of my battery?
After the P3227 update, Hx is very close to SOH^2 on our LEAF:

Image
RegGuheert
2011 Leaf SL Demo vehicle
10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

Henchman
Posts: 28
Joined: Wed Mar 25, 2015 9:07 pm
Delivery Date: 26 Mar 2015
Leaf Number: 8376

Re: What does the Hx percentage mean?

Sun Apr 12, 2015 4:15 pm

My HX is now down to 58%

yujungchang
Posts: 35
Joined: Fri Apr 26, 2013 10:44 am
Delivery Date: 07 Jan 2013
Leaf Number: 023949
Location: Sacramento, CA

Re: What does the Hx percentage mean?

Tue Mar 22, 2016 3:05 pm

Wonder if that could be Heat eXposure?
2012 SL @Jan 2013, mfg: June 2011,
4rd: Sept 16, 45.8k, 42.19AHr, SOH64, Hx43.06
3rd: May 16, 42.5k, 45.70AHr, SOH69, Hx48.86, OBC failed Dec 15, 130+QC,1440+L2
2nd: Oct 15, 34.0k, 51.58AHr, SOH78, Hx60.88
1st: Oct 14, 24.5k, 55.68AHr, SOH84, Hx70.57

cwerdna
Posts: 8224
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: What does the Hx percentage mean?

Tue Mar 22, 2016 6:15 pm

yujungchang wrote:Wonder if that could be Heat eXposure?

From a copy paste of the manual the author mailed me:
Hx The meaning of this number is not fully understood but it appears to be inversely related to the battery internal resistance. As the internal resistance of the battery pack increases it is thought this percentage decreases. As internal resistance increases more energy is lost within the pack and the pack heats up more under load.

This passage is the same as what's in the app's own help.

'13 Leaf SV w/premium package (owned)
'13 Leaf SV w/QC + LED & premium packages (lease over, car returned)
'06 Prius

Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

Tsiah
Posts: 88
Joined: Fri Jan 06, 2017 1:52 am
Delivery Date: 01 Oct 2017
Location: Salt Lake City

Re: What does the Hx percentage mean?

Sat Jun 16, 2018 1:00 am

cwerdna wrote:From a copy paste of the manual the author mailed me:
Hx The meaning of this number is not fully understood but it appears to be inversely related to the battery internal resistance. As the internal resistance of the battery pack increases it is thought this percentage decreases. As internal resistance increases more energy is lost within the pack and the pack heats up more under load.

This passage is the same as what's in the app's own help.

Excellent! Thank you!

cwerdna
Posts: 8224
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: What does the Hx percentage mean?

Sat Jun 16, 2018 1:34 am

^^^
Also, see some pointers to historical posts about SOH and Hx at viewtopic.php?p=516611#p516611.

If I read it right, Leaf Spy apparently used to show an old health value (Hlth) but that got renamed to Hx. The more newly discovered health value became SOH.

'13 Leaf SV w/premium package (owned)
'13 Leaf SV w/QC + LED & premium packages (lease over, car returned)
'06 Prius

Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

LeftieBiker
Posts: 9412
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: What does the Hx percentage mean?

Sat Jun 16, 2018 2:45 am

It's been my theory that Hx - at least before the 40kwh pack - represents a momentary "snapshot" of the same value that SOH represents, with the SOH being a longer term average. Maybe, maybe not. The Hx number for the 40kwh pack seems more disconnected from the SOH, at least while the packs are new.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

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