powersurge wrote:Amazing work... Nice to see a forum member that can really attack this car...
COULD I ASK YOU FOR AN AMAZING FAVOR THAT CAN BENEFIT ALL OF US MECHANICAL TYPES?
PLEASE WRITE A LIST OF THE PROCEDURE OF HOW YOU TOOK OUT THE BATTERY....
I would love, down the road to try replacing a battery on my own....
I watched two youtube videos before attempting this, they showed this much more in detail. Just google Nissan Leaf Battery Removal, they are gold!
Since you know they're bad, you may wish to replace the two cells as soon as possible. If you wait too long, the BMS may remove a health bar, making yours an 11 bar car. Unless you know how to do a BMS reset, you'll be stuck with an <12 bar car with a good battery.
Noted, It is strange how this hasn't already happened, the previous owner seems to have put 700km on it in this shitty state somehow! Replacing is still top prio!
goldbrick wrote:Could you explain why the voltage droop indicates high internal resistance? Is this due to the re-balancing going on or is this just how Li cells degrade or am I just missing it?
And once again, very nice work and thanks for sharing!
Ofcourse! I've done tons of Lithium 18650 battery salvaging in the past, and that involves running them thru a capacity check. When dealing with lithium of unknown quality, the first step is to charge it up and let it sit at maximum voltage for a day or two. If any significant vdroop occurs, internal resistance due to microscopic cracks inside is usually the reason, and the cell needs to be recycled.
DaveinOlyWA wrote:Great way to stave off reality for what I think will be a few weeks at the most. Balancing happens all the time and every second, those two cells will fall farther and farther behind. I would replace them ASAP if not sooner.
Yeah I know, I just need this for a daily driver while I wait for a cell
WetEV wrote:I worry that the real problem is a bad BMS. For some reason, perhaps the BMS is always discharging these cells.
Yeah as ElectricEddy also said, when I do the actual replacement, After replacing the cell, I intend to also swap the 57&58 with say 59&60 to get a baseline of the BSM state.
Thanks to all involved, this forum is great!