As painful as it is to say, your dealership is actually right on track with today's pricing and info.
That article is posting cost numbers with no actual citations of when and where they are getting those numbers from.
Those numbers are definitely incorrect. Waaaaayyyyy too low.
Now, it is true that back in 2014 when Nissan was in the middle of a Public Relations nightmare, they did, for a very brief time, install 24 kWh packs for under $6,000. But no way was that sustainable. That program went away one the PR kerfuffle went away.
Your reply from the dealership is much more based in the current reality.
As an EV shop, I am getting quoted ~$10,000 just for the part (24 kWh 85 miles) when buying from the Nissan parts department. Retail markup and labor would be additional.
Also, as you noted, no way is the Nissan dealership ever going to put a larger battery in a 24 kWh car. Nope.
In addition, generally you need to return a core the same size as what you purchase from them.
While Greentec is offering to put Degraded packs into people's cars, they
*are not putting in OEM New packs/cells*. Read the fine print closely that states the amount of degradation you can expect on the packs they install. Also look closely at the caveats where they limit the amount Quick Charges you can do (no more than once a month I think), else you void your warranty. Ouch. There's even more "gotchas", but I'll leave you to read their info.
At independent Leaf Repair Network shops like mine, they can install the aftermarket LRN 40 kWh battery for the Nissan Leaf into your 24 kWh 2015.
- All New cells
- 150 mile range
- 3 year/36,000 mile part warranty
But the cost is more than some of the Used EVs these days. ~$14,000 + tax.
https://leafrepairnetwork.com/
This is a topic I'm passionate about and would be happy to chat about any time. Just reach out to my shop 608-729-4082
EDIT: I see that the site Haldir linked to is focused on selling Used EVS. A cynical person might say that it makes sense why they may be (inadvertently/incorrectly?) under-reporting the actual price of replacement batteries. If people knew the actual price $$$$$ they may be less likely to buy a Used EV. Hopefully it was simply oversight and they just need to update the article with current data. I notice the article is not dated, and doesn't have dated citations, so they may be operating off of old assumptions.