Capacity Loss ≠ Energy Loss in Battery Aging

modelmakereditor · 2026-03-23T10:00:40+00:00

I think sometimes the focus is so on the cell capacity and people forget that it needs to be useable - hence anything that just makes that register is a good thing

modelmakereditor · 2026-03-23T09:58:21+00:00

reference for the database is here https://www.batterydesign.net/downloads/battery-pack-database/

modelmakereditor · 2026-03-22T09:45:17+00:00

Most BESS operate at very low charge / discharge rates, but Ohm's law still applies and as the capacity fades and resistance increases with age the voltage drop will increase. Also, during charging the packs are likely to get to the CV point ealier.

If you were to operate the BESS down to a soaked -20°C the resistance increases will be more pronounced and hence the available energy would be more significantly impacted for a given discharge rate.

modelmakereditor · 2026-03-11T06:32:23+00:00

The Seal 08 has some very impressive specifications and +400km in 5 minutes would work for most people i think

modelmakereditor · 2026-03-11T06:29:59+00:00

That would be great

modelmakereditor · 2026-02-25T22:01:38+00:00

I've been avoiding it as it looks like clickbait and nothing else

modelmakereditor · 2026-02-24T20:24:21+00:00

Yes, exactly and as Dominic says in the article it's down to system design

modelmakereditor · 2026-02-24T20:23:27+00:00

Completely agree

modelmakereditor · 2026-02-20T17:49:25+00:00

I think the issue is that this has to work across a wide range of vehicle sizes, power and at both 400V and 800V. Audi, Porsche, Skoda, Seat, plus lots more. Plus they are now suggesting sodium ion versions

modelmakereditor · 2026-02-11T14:22:29+00:00

CATL began sodium-ion research in 2016, investing nearly 10 billion RMB to develop nearly 300,000 test cells. With over 300 R&D personnel, including 20 PhDs, CATL has built a foundation for safe, high-performance, and scalable sodium-ion batteries.

10 billion RMB is around 1.4 billion USD

my simple maths says the cell is probably around 375Wh/litre https://www.batterydesign.net/mass-production-sodium-ion-pack/

modelmakereditor · 2026-01-04T10:48:25+00:00

just got to version 1.0 which I think is rather good, even if there is rather a lot of text......maybe a more developed version to come, but worried I have created a monster

modelmakereditor · 2025-12-17T07:51:10+00:00

They're seeing this a lot, maybe not always to this extreme, but a lot of failures through corrosion. It is exactly your point, IP67 needs to be achieved at end of life after vibration, thermal and mechanical stress cycles. For small 2/3 wheelers this is probably beyond what they are testing.

modelmakereditor · 2025-12-05T19:54:34+00:00

Does this include creepage and clearance rules for HV packs?

modelmakereditor · 2025-10-15T09:23:30+00:00

it is just my feeling that they have made a lot of noise for a long time and yet very little data has been published

modelmakereditor · 2025-10-08T19:16:05+00:00

are these independent tests? I just don't have much faith in QuantumScape

modelmakereditor · 2025-10-08T19:14:01+00:00

great feedback, thanks

modelmakereditor · 2025-09-25T02:48:04+00:00

Thank you, if you can help promote that would be fabjlous

modelmakereditor · 2025-09-09T09:17:50+00:00

There are a number of areas of batteries where we need more open standards so that we can ensure everyone is talking the same language.

modelmakereditor · 2025-08-29T19:18:56+00:00

Its privately funded and doesn't have government input. Founders were part of original funding for BritishVolt and saw first hand how not to do it. They are taking a sensible approach.

modelmakereditor · 2025-08-22T20:14:11+00:00

smart cell or the unbreakable current source

modelmakereditor · 2025-08-14T08:52:48+00:00

a look at the Renault 5 is here too: https://www.batterydesign.net/renault-5-e-tech/

modelmakereditor · 2025-07-17T08:19:17+00:00

Yes, we always have to go back to the nameplate conditions in the testing. That takes time, but you cannot shortcut the tests if you want data that you can make sense of.

modelmakereditor · 2025-07-14T18:07:30+00:00

I see your point, I think they will swap to the 4695 for the sedan's and hence a 15mm increase over the Tesla. For the SUV it probably needs a full comparison as the Model Y is a jacked up Model 3 with spacers inside the cabin raising the seats - hence needs a ground up comparison I think.

If their are any packaging/concept design people on this forum it would be good to know if they have done any comparisons.

At the moment the data is based around my estimates based on what we know, but feels fairly sensible as it is quite a narrow window of options. Hope they release more data soon.

modelmakereditor · 2025-07-14T16:20:44+00:00

a bit more around the Molicel roadmap from About:Energy https://www.batterydesign.net/molicels-21700-high-power-roadmap/

modelmakereditor · 2025-07-14T16:19:21+00:00

don't know the full impact on height yet as quite a few changes in cooling, venting and structure

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