Guess the degradation over the past 50 000km (30 000mi)?

[@ThanosSustainable]

Capacity depends greatly on the discharge rate; testing at 0.5C definitely has an effect, how much depends on the internal resistance of the battery. You can only claim they there was not degradation if you’d done the same test before.

[@SheepShearerMike]

It is looking like a very good battery life then, should outlast the car. I see you got a name check on the new episode of TEN from Transport Evolved, hopefully it will lead to more orderes. Hopefully i will eventually buy an EV myself in the next few year then might have some extender batteries added to that. Keep up the good work.

[@davegiles5869]

Hi only just found your channel and working through the previous episodes I have a 2015 24KwH with degradation already showing itself with only 24,000 miles and I am based in the UK have your done any checks to see if it’s possible to fit 30 or more KWH worth of your cell packs in place of the Nissan fitted version in the standard traction battery tray. Your work so far has gone down the same path as I had been designed working but you have found a much better cell for size.

[@stealthirl]

Would be interesting to see how a main 24kWh battery looks on this V leaf spy. Mine reports 20.1-20.4kWh when fully charged

[@mjk8019]

Damien Murray good for you. I have 15kwh only.

[@stealthirl]

mjk what year and mileage do you have ? Mines just over 5 years old with 55,000 km Leafspy reports low 90s SOH

[@mjk8019]

Damien Murray 2013 with 105000 km 68% SOH.

[@danielwilliams8649]

Just got a damage windshild replaced on the nissan env200 by an auto glass replacement company and I just released that the wipers are forced down and never move at all. Before I go back enquiring on what may of happened, I would like your opinion since you seem to be the most experienced hands on technician on you tube with the nissan env200. Thank you

[@PowerElectronicsBlog]

Can't help with this particular issue (I haven't been looking at the windshield wiper section of the e-nv200), but if you want you can e-mail us and I can send you the service manuals so you can figure out what may have happened yourself. Note that I have almost all of my experience with the drivetrain, very little with - no offence meant - 'regular' maintenance and repair)

[@akaDavidWebb]

Wow. Deeply impressive! Meanwhile on the main traction battery..!

[@okazakijap]

I thought my smartphone frozed.

[@gorazdnovsak3705]

Hm... I was thinking. In a old video you did figure out that main battery discharges first and then the extender... Could that be a reason since you have battery close to full. Shallow discharge cycles...

[@lsh3rd]

I think they are wired in parallel.

[@gorazdnovsak3705]

@@lsh3rd Yes but main battery discarges more at higer voltage and extender at lower voltage... I will look for that video when I get myself behind a computer...

[@lsh3rd]

@@gorazdnovsak3705 Makes sense... the voltage will remain constant, but the power drawn from each pack will be inherently different since the capacities are different. I asked in another comment if there will be any issues with this happening as the main pack degrades.

[@gorazdnovsak3705]

@@lsh3rd it is not capacity. Chemistry is a reasen in this case.

[@t0mmiiiii]

@@gorazdnovsak3705 i understand that the extender battery has way lower resistance.

[@Mikael150381]

Most impressive is the 4:3 screen. Battery is also ok.

[@tarassu]

Yea I was already adjusting my aspect ratio

[@AmigaWolf]

Yeah with Windows XP.

[@Tore_Lund]

Muxsan, what kind of modules are you using for your upgrades?? Are they hybrid car modules or industrial?

[@AtouchOfFury]

Hey, firstly I love your channel but is there any chance you could post of your community so we can connect with you? I have chance of a 40khW pack from a 2018 leaf and would love to have it in my 2012 leaf. I'm Uk based I'm also on facebook Paul Bulmer York. You are an EV Legend thank you for your channel

[@typxxilps]

any updates soon ?

[@janekw.6022]

Just stumbled over your channel very interesting work you have done! 👍 Is there any way to contact you directly?

[@PowerElectronicsBlog]

Yes, info at muxsan dot com

[@ktrontrontron]

What generation are those cell leaf modules? they dont look like the standard "rectangle tuna can" style i'm used to. Thanks! Always great to see your postings!

[@PowerElectronicsBlog]

Not from a Leaf, but from plug-in hybrids.

[@lsh3rd]

Do you anticipate any issues with the two different packs degrading at different rates? Or, does the second parallel pack simply have more power drawn from it, so the voltages remain constant between the new and old packs?

[@PowerElectronicsBlog]

They're hard-wired in parallel, so they'll pretty much have to equalize. They also internally balance continuously.

[@amunderdog]

Battery abuse? I understood from years ago; A rechargeable did best if ran low before recharge. I can remember some people had a test stand thingy. They would run a new battery as close to zero as possible then recharge it; I think I remember they would do this a few times before putting the battery into service. Something about a memory the battery assumes. Has this changed? Did you try the other way? Recharge a pack when it really does not need a charge, day after day.

[@NinoJoel]

That was the corect method for old battery type's like Ni-CD Ni-HM PB and others. However Lithium batterys dislike this methods of charging greatly. It shortens their live span in extreme ways. If you want the longest live of a lithium based battery like in Phones and these scooters or your laptop, you should recharge them when they are at 10% and stop charging at around 90%. There are statistics that prove this charging methode increases the lifespan extremely.

[@PowerElectronicsBlog]

Batteries don't like being fully charged and batteries don't like being charged quickly. We tried to do as much as that as possible in the past year and a half, exactly because I was planning to do capacity testing and wanted to be sure our warranty terms wouldn't cause issues down the line.

[@xxwookey]

You are thinking about NiCad batteries. An older technology, superceded by first NiMH (similar in most ways but higher capacity and much less prone to the memory issue the above full discharge was trying to avoid), and then lithium-ion. Almost all car batteries (and all modern car batteries) are lithium-based which has quite different needs. Amongst other things they must never be discharged below 2V per cell - that is what 'empty' means. A totally flat lithium cell is dead if it's been left like that for long.

[@Tore_Lund]

@@NinoJoel Lead acid batteries did not like to be run down before charging. Having driven multiple Lead acid EVs, you are either driving or plugged in, Leaving Lead acid batteries semi charged without charging them is the fast track to sulfation of the plates. You use the charger to float charge them when not driving, i.e. all the time.

[@jdphotograph]

Where did that battery come from. What type is it ?

[@PowerElectronicsBlog]

plug-in hybrid batteries. The reason they basically don't degrade (or heat up under any circumstances) is because they're rated 5C continuous, 10C peak. They're monsters of batteries and we only use them very gently.

[@jdphotograph]

@@PowerElectronicsBlog thanks for the reply. Can we also buy them from you here in South Africa ? Will you sell your solution to use over here as we also have some Leaf owner here that would love to extend the range.

[@nimalweerasinghe4576]

where i i can same battery for nissan leaf

[@douglasalanthompson]

Was this a Nissan cell?

[@marsrover001]

Nissan leaf hacking should be getting popular soon. They sell for very cheap near me with heavily degraded packs. (Intense year round heat kills the packs)

[@ladsongeddings100]

There should be a large aftermarket for refurbished Leaf batteries since Nissan is charging $9k for a replacement 24kWh battery. Perhaps someone will offer this service.

[@MrLambert76]

Seems like I bought a pretty good product :-)!

[@GoingOffGrid101]

Great test! I have a 2012 leaf and my regen is almost non existent with 8 battery bars, is there a way to get it working again ? also I have a 28Kwh battery I plan to put in the trunk, will this show on how many Km I have left on the car? I just subbed!

[@PowerElectronicsBlog]

Yes, with the MITM board you can regain full regen ability.

[@GoingOffGrid101]

@@PowerElectronicsBlog where can I buy this?

[@GoingOffGrid101]

@@PowerElectronicsBlog i searched for mitm board and found nothing. where can I get one

[@bluezzer1]

I think there is a flaw in your logic. TLDR; I suspect you are comparing current capacity against rating, not the original capacity. That makes your results meaningless. Surprising given how technical your channel has been and part of the reason I like it. My reasoning; there is no way the capacity went up by 0.5% (unless it’s within the error range of your instrumentation). I think it was simply over capacity initially as most Lithium cells are when new. I tried to find your initial test in case it was done before I subscribed, but couldn’t find it. Of course pls correct me if I’m wrong!

[@cameratests]

I am curious about this too, bluzer 1. For instance, in my Surface Pro, I can run a battery report. It has a design capacity and an actual capacity due to slight differences in manufacturing. It reports a 103% capacity. Some cell phone batteries advertise for instance, an average of 3,000mAh but have a minimum guaranteed capacity of say, 2,850mAh. Could it be that these Leaf batteries have a "designed capacity" and on some cells we may win the "lithium lottery" and get a few extra percent of capacity. Perhaps I am just re-stating what you said above in a different way. Also, full charge cycles can play a role in degradation, correct? With a larger pack, the cells don't last for more cycles but you discharge and recharge less frequently. If I drive 12,000 miles in a year at 4mi/kW and my pack is 20kWh, let's say I get 70 miles before charging at 12.5%. Then that would be 12,000/70 = 171.42 cycles in a year. If I have a 60kWh pack at the same efficiency, then on a 240 mile range care driven 210 miles to the same 12.5% remaining before recharge, I net 57.14 charge cycles in a year. This is not surprising. 1/3 of capacity needs to charge 3x more often to travel the same distance. So a Chevrolet Bolt with active thermal management on the battery at 100,000 miles, should have similar degradation to a 20kWh usable car set up similarly with only 33,000 miles on the odometer. (Not a Leaf sadly).

[@PowerElectronicsBlog]

Of course, I've done the same capacity test before installing the batteries, and I'm continuing to do tests on a bunch of packs. I think I mentioned in my last video that the packs I installed as an extender were spot-on 25Ah before installation, so they really didn't degrade. That being said, this is just a spot check, the only way to get real data is to do continuous testing on many modules, which is something I also said in this video I'll be doing.

[@xxwookey]

@@PowerElectronicsBlog Do you have a log of temp at test time, or multiple tests to get the variance on the test procedure? Interesting result, but actually _zero_ degredation (indeed apparent 0.5% improvement) really is quite surprising. I am wondering if some small effect like time or other randomness accounts for the 0.5%. I'd have expected the differential environment of the in-boot and under-car packs to have some effect, given that we know temp during charge matters (and presumably the ones in the boot are quite a lot warmer in winter?) But in general I guess this is more evidence to add to the 'bigger batteries degrade more slowly than smaller ones' pile.

[@tarassu]

My offer is 6 percent

[@GadgetFrank71]

4%