sneaky wrote: ↑
Sun May 24, 2020 7:30 pm
I have been overly plagued with this leaf battery problem to no end on my 2015 SL. ..........In the meantime I had been working my own DIY lithium battery solution, and had purchased a battery from Amazon for $100 "ECO-Worthy 12V 20Ah Lithium Iron Phosphate Battery, Rechargeable LiFePO4 Battery Pack". ......... The battery now stays above 13v, charges at 14.5v, everything seems fine now. When the battery gets under 12.5v all kinds of wacky things start to happen on that Leaf. I'm surprised the dealer didn't check the battery when they were diagnosing the telematics again. Also that telematics unit that the dealer said was bad is working fine now. If my DIY project fails I'll report it, but for now, it seems like a cheap solution. Amazon also has a 30ah version for $150, I probably would have got that one but it wasn't there when I got mine. Thanks to all you bloggers for sharing, maybe this helps someone as well.
What a 12V journey! So bad to spend so much time and money!
This is a copy of my post on the brake "lurch" problem I've had multiple times with my 2012 Leaf from viewtopic.php?f=30&t=28983
"Periodically, my 2012 will start "lurching" during braking - especially when just enough braking is applied to maximize regen. At times, the final "stop" of braking also grabbed excessively - only during the final few feet of stopping. The U1511 0108 and U1232 0108 both had been thrown.
I tried the "put the brake to floor for 30 seconds" technique and it did seem to help the "grab" at stopping, but no affect on the surge/lurge at speed. I then measured the settled 12 volt system voltage at 12.4 volts - very low for a FLA battery - so definitely in need of an external recharge. Over last weekend, I set up 2, 2 amp chargers and let them charge. I finished with a 15 amp (40 year old) charger for a day. The result is NO SURGE, NO LURCH - yet. No "grab" either. At first sign of any return surge, I'll measure the settled voltage again, and recharge again. We'll see.
Not wanting to start a "lurch" war, but I've had years of Chevy Suburban bad/warped rotors and know exactly how that "cycle" feels - at essentially every braking event above certain speeds. The regen/braking "lurch" of my Leaf is very different and distinctive as it cycles at much less frequency than a warped rotor. Again, it's anecdotal, but twice I've been able to completely eliminate the "lurch" by charging up the 12 volt system - and totally eliminates the problem - for a while!
How that regen "lurch" is generated - no idea
Back to this post!
Today it measured 12.25 "settled" volts on my FLA battery (Jan 2019 replaced the original). I drive this vehicle almost everyday - charge it about every other day - 80% early morning charge. Voltage during initial charge cycle was over 14v, coming down within a hour to slightly over 13v. I need to load test the battery, but I don't believe it is bad (yet). the brake "lurch" has not come back yet, however, the final stop "grab" is starting to.
I'll keep monitoring, however, at this juncture, I have to conclude the the 2012 leaf (12v ) charge profile is quite bad, leads to funky brake problems, probably not bad enough to ruin FLA batteries quickly (the light duty on the battery may be the savior). BTW, I have never signed up for the wifi service (not even sure what it is called for the 2012 - the problematic "telematics"?
2012 Leaf SL; 46,000 miles. Battery replaced November 1st, 2016.