Hmmm I've been coming to this conclusion and I'm gobsmacked there isn't regulation towards a standard drop-out/in battery pack standard across the industry.
That would be too easy and not in tune with the industry's perpetual drive to make vast profits from even the simplest of spare parts. If the whole industry had a standard set of battery packs, 40kw, 80kw, 100kw and 200kw with exactly the same pack used in all the different manufacturers tailored to their own particular configurations, that would be the best solution. Just as the dry cell and rechargeable battery industry has basically settled on the AA and AAA standard, it may eventually (probably not in my lifetime) happen with battery packs for vehicles. The other thing is the way the auto industry works world-wide. A manufacturer designs a vehicle, with all the elctronics set up as a series of input-output modules. They then tender the "boxes" to sub-contractors who are just given the specifications of the inputs given and the outputs required together with maximum dimensions and environment requirements for that particular component or box. The sub-contractor that tenders the cheapest price within specification gets the contract.
The motor manufacturer probably never gets to see the actual schematics and component count-they aren't interested.
This is the reason for instance, why BMW are able to charge North of £2000 for a simple ecu computer. They buy a batch of spares from the supplier that is enough to last 10-15 years then put a massive mark-up on the box. By the time 20 years have passed, the original sub-contrator may have long gone out of business, all the schematics and details of what is inside the box are lost in the mists of time.
There are then only 2 options available to replicate that box. Take the original input-output specs and redesign and build from scratch a replacement, or to reverse engineer the original box. That takes an engineer with a particularly high-level skill set and with the present throw-away society the pool of talent with those sort of skills is shrinking rapidly.
There is a glimmer of hope. The present fascination with mini-computers such as the raspberry and the many young people dabbling in electronics as a result may yet offer a way out of this rabbit hole. It would be a much easier task to replicate and build from scratch such an item, the only issue would be access to the required software from the manufacturers.
They are notoriously secretive when it comes to their proprietary software, but 2021 legislation on the "right to repair" by the EU and the UK is a step forward in making the motor industry conform to legislation. It is a small step, but the principle has now been established; at the moment it only applies to white goods and TV's. The object being to reduce built-in obsolescence and reduce the landfill for scrap white goods and tv's with all their nasty rare elements.
So sorry to all for this long-winded narrative, I just wanted to point out things are not as simple as it seems at first glance.
