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Re: Battery Upgrades are very possible

Posted: Thu Jul 04, 2019 7:21 am
by Acura4Ever
Kebin, if a remember correctly, muxsan said to it will be possible eventually to add gen 2 batteries int leaf 1 using only the CAN man in the middle bus with is latest video of his projet. But I will be tested later this year.

Re: Battery Upgrades are very possible

Posted: Thu Jul 04, 2019 9:55 am
by Dala
kebin wrote:Thanks for the update and nice work!

I thought you were going to put the CAN bus man in the middle adapter between the battery and the VCM in order to avoid having to open the packs and do the cell swap.

I wonder whether this approach is feasible, if it was, and if 40/62kwh batteries are electrically compatible with leaf gen1, it would mean that you could upgrade a gen1 with a gen2 battery quite easily, by just translating the protocols on the fly.


EVs Enhanced over in NZ is working on this. They will offer OBD2 flashing to make the 30kWh pack work with a 24kWh VCM, without having to open it up. I am doing this the bruteforce method, and there will surely be better methods available in the future. 40kWh is the next step, but 62kWh is afaik mechanically different. We don't know how different yet, there aren't many crashed 62kWh packs floating around yet...

Re: Battery Upgrades are very possible

Posted: Thu Jul 04, 2019 2:30 pm
by GerryAZ
I subscribed to Nissan Publications for a short time to look at the service manual for 2019 because I am considering replacement of my 2015 with a new SL+ and want to know some of the technical details. There are a lot of differences between the 40 kWh and 62 kWh versions. The number of modules is completely different between the 62 kWh and 40 kWh packs. Also, the 40 kWh packs have fewer modules than the 30 kWh and 24 kWh packs so upgrading by just swapping cell modules will not be possible. I will be watching developments in this thread.

Re: Battery Upgrades are very possible

Posted: Fri Jul 05, 2019 11:30 pm
by Oilpan4
I too am a fan of the brute force method.

Re: Battery Upgrades are very possible

Posted: Mon Jul 08, 2019 12:01 pm
by Dala
I now have some data! Did a lot of driving over the past days to get a feel for the new pack. I managed a comfortable 205km at 15-13*C with no AC or heat. I averaged 7.3km/kWh, due to me slowing down after going past 0.0% SOC.

The first 100km I drove 85-100km/h. The second 100km I drove between 60-85km/h. Here is what the 24 LBC instrumentation said:

16% dash, 114km travelled. Low battery warning!
8% dash, 135km travelled. - - - km remaining
- - -% dash, 142km travelled, - - - 3.66V min cell voltage (Leafspy 12.3% SOC)
150km travelled, 3.64V min voltage (3.61V under load), (Leafspy 7.6% SOC)
165km travelled, 3.58V min voltage (3.53V under load), (Leafspy 0.0% SOC)
205km travelled, 3.37V min voltage (3.30V under load) (Leafspy gave up a long time ago...)

I could probably have kept driving until turtle, and waited for the contactors to open, but I really didn't want to strand myself. Taking it slow, it would probably been possible to drive 220-230km on a single charge. I love the 30kWh battery, but the instrumentation needs fixing asap, Half of the range is left after it indicates the first low battery voltage lol!

So, question to you leaf-gurus, what is the turtle cell voltage on a 24 LBC? And how low would you comfortably go? I chickened out at 3.30V under load, but it might be possible to squeeze more out of the pack?

Re: Battery Upgrades are very possible

Posted: Thu Jul 11, 2019 3:44 am
by Oilpan4
I think that's what happens when a older leaf battery is repacked with 40kwh modules.
A good portion of the range you gain is between LBW and turtle.

Re: Battery Upgrades are very possible

Posted: Thu Jul 11, 2019 4:56 am
by Dala
Oilpan4 wrote:I think that's what happens when a older leaf battery is repacked with 40kwh modules.
A good portion of the range you gain is between LBW and turtle.


I think the 40kWh is even better when you do it the bruteforce method. Theoretical calculations would be ~150km before low battery warning, and possible to drive up to 300km (150more) between LBW and turtle.

I actually just got a message that a 2018 ZE1 40kWh was crashed this week, and I got first dibs on the pack! Will be interesting to look at a 40kWh pack too, and perform that bruteforce upgrade too!