DaveinOlyWA
Posts: 14043
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 16 Feb 2018
Leaf Number: 314199
Location: Olympia, WA
Contact: Website

Re: How often to "Cell Balance"? Weekly? Monthly? Depends?

Sun Feb 10, 2019 2:31 pm

LeftieBiker wrote:My car goes back to perfect balance after one full charge - so far.
You have LEAF Spy, right? How consistent are your full charge stats? GIDs, Ahr and kwh available? Cause mine are anything but
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 deceased. 29,413 miles. 2018 S40; 15,000 miles, 478 GIDs, 37.0 kwh 109.81 Ahr , SOH 94.61, Hx 120.15
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LeftieBiker
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Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: How often to "Cell Balance"? Weekly? Monthly? Depends?

Sun Feb 10, 2019 3:52 pm

I'd have to go back and look. I mostly look at SOH, Hx (at first) and the balance and voltage differences.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

DaveinOlyWA
Posts: 14043
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 16 Feb 2018
Leaf Number: 314199
Location: Olympia, WA
Contact: Website

Re: How often to "Cell Balance"? Weekly? Monthly? Depends?

Sun Feb 10, 2019 5:01 pm

LeftieBiker wrote:I'd have to go back and look. I mostly look at SOH, Hx (at first) and the balance and voltage differences.
:lol: Yeah, I know what you mean. I don't really look at Hx either any more :)
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 deceased. 29,413 miles. 2018 S40; 15,000 miles, 478 GIDs, 37.0 kwh 109.81 Ahr , SOH 94.61, Hx 120.15
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

Reagle
Posts: 59
Joined: Wed Apr 11, 2018 8:05 pm
Delivery Date: 25 Jun 2018
Location: Upstate New York

Re: How often to "Cell Balance"? Weekly? Monthly? Depends?

Tue Jul 02, 2019 11:45 am

My car had a bad battery cell (actually a pack of 2 I think) replaced at 8k miles a few months ago, and it still can't seem to get its balance back. the new cells are a good 80mV above the rest.. Any suggestions? I've been contemplating deep discharge but it's a hassle. I suppose I can try leaving it plugged in after charging for a while if most balancing happens at the tail end. Currently it's charged on the timer and usually is ready 30 minutes or so before I leave, so it never actually sits for a long time plugged in
2018 Jade Frost SV with tech and weather packages
Delivery: 06/2018
Build date: 03/2018

LeftieBiker
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Re: How often to "Cell Balance"? Weekly? Monthly? Depends?

Tue Jul 02, 2019 12:15 pm

If all three dash charging lights turn off, it's as balanced as the car will get it. You could try running it down to near Turtle Mode and then fully charging it.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

Reagle
Posts: 59
Joined: Wed Apr 11, 2018 8:05 pm
Delivery Date: 25 Jun 2018
Location: Upstate New York

Re: How often to "Cell Balance"? Weekly? Monthly? Depends?

Tue Jul 02, 2019 1:35 pm

Yeah, by the time I leave no lights are on on the dash , and Chargepoint is not showing anything going on. ..
I called the dealership, but I might as well be talking to the wall when trying to explain to service advisor that my cell voltages are out of whack
2018 Jade Frost SV with tech and weather packages
Delivery: 06/2018
Build date: 03/2018

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Nubo
Posts: 5314
Joined: Fri May 28, 2010 11:01 am
Delivery Date: 31 Oct 2014
Location: Vallejo, CA

Re: How often to "Cell Balance"? Weekly? Monthly? Depends?

Tue Jul 02, 2019 4:40 pm

Reagle wrote:My car had a bad battery cell (actually a pack of 2 I think) replaced at 8k miles a few months ago, and it still can't seem to get its balance back. the new cells are a good 80mV above the rest.. Any suggestions?
A couple of cells sitting 80mV above the others at the top end isn't really a problem, imo.

Just give it a good 100% charge and allow it to sit plugged in for a good 4 hours or so after charge completion. A few rounds of this may bring them closer in line but I wouldn't worry about it.
I noticed you're still working with polymers.

Reagle
Posts: 59
Joined: Wed Apr 11, 2018 8:05 pm
Delivery Date: 25 Jun 2018
Location: Upstate New York

Re: How often to "Cell Balance"? Weekly? Monthly? Depends?

Tue Jul 02, 2019 9:31 pm

Interesting, I tried that and I see four 5 minute pulses at the end where charge current goes to 0.6kw then to 0. In my daily use I see at most one of these,Once past 30 minutes though nothing is happening so far
2018 Jade Frost SV with tech and weather packages
Delivery: 06/2018
Build date: 03/2018

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

Re: How often to "Cell Balance"? Weekly? Monthly? Depends?

Tue Jul 02, 2019 9:41 pm

I don't think that leaving it plugged in for hours past the end will add any charge. Smart chargers for smaller packs will do that, but AFAIK the Leaf decides that charging is over when the blue lights all go out.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

User avatar
Nubo
Posts: 5314
Joined: Fri May 28, 2010 11:01 am
Delivery Date: 31 Oct 2014
Location: Vallejo, CA

Re: How often to "Cell Balance"? Weekly? Monthly? Depends?

Tue Jul 02, 2019 11:32 pm

LeftieBiker wrote:I don't think that leaving it plugged in for hours past the end will add any charge. Smart chargers for smaller packs will do that, but AFAIK the Leaf decides that charging is over when the blue lights all go out.
I thought it would bleed charge from the high cells with the shunt resistors. In any case I wouldn't worry about the new slightly higher cells. They're in no danger of being overcharged if they're only 80mv above the mean.
I noticed you're still working with polymers.

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