the batteries problem.

It's different use cases - you can't handle an EV battery that only lets you accelerate 0-60 in 89 seconds, but that same EV battery can power the street lamp and similar loads for weeks between charges without trouble.

It would be super easy to make it modular so the batteries can be swapped when they reach end of life. A well maintained lithium cell can last decades though if it is charged and discharged at relatively low rate.

The point of going low density is to reduce cooling requirements. Cramming them into a shipping container is the exact opposite of that.

They do this for festivals and construction sites and such in conjunction with the typically fossils generators nowadays. Not everywhere but it definitely exists. Exactly like described: Shipping container, batteries and inverter inside, 4 legs, and 2 Shipping container long solar arrays mounted to a frame. Set the container down anchor the legs put the panel frames up connect some wires and your ready to go.

I'm pretty sure you could just buy that too if you wanted a head start on your off grid cabin.

It damages their credibility

But isn't this exactly the thing the article is talking about? Using the degraded batteries that are no longer fit enough to be used in cars, but might still have 60-70 % capacity and be well suited for slow charging and stationary energy storage.

They discuss this in the article. Used batteries are not their bottleneck, at least for this company. The issue is incorporating all the different designs/chemistry's/states safely:

The company has more than one GWh of batteries ready to go and expects to add another five GWh this year. Ultimately, the bottleneck to scale isn’t battery supply — Redwood takes in more than 20 GWh of batteries each year. is the safety qualification process required to put batteries out in the field. Sun explained that the core architecture, racking, pack manager, and software can handle multiple chemistries and form factors, but getting them past hurdles like the rigorous UL 9540A fire safety testing Redwood recently passed in-house is another matter.

Maybe, but that isn't clear. Like I said, I don't have fuel source statistics, even though that is important. I suspect it is too early to gather those statistics.

The Prius has some battery replacement, but my impression is most of them the battery lasts for life, only in a few cases is it seen as worth it to replace a battery (or just a dead cell?). EVs have not been around long enough to really develop this industry - if it ever will develop.

The leaf is an outlier - their battery management system was poor and it killed the battery in ways that nearly every other make avoids. The leaf sold in enough numbers, long enough ago, that I'd expect to see an industry to replace the battery if one will happen and it doesn't seem to be as large as one should expect. This is a sign of something - but what it is too early to tell.

Hasn't the Prius also generally used NiMh batteries rather than the Lithium-based chemistries?