Split 4 double battery pack

Hello Twizzers!
On YouTube there’s a video of a guy that makes a split for the Nissan Leaf to connect an extra battery. Would it be possible to do it?
What if I add another Twizy battery?
With an identical battery, identical bms…
What about If I make a smaller battery pack just to give few extra miles (like 10-15)?

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It would be cheaper to use a Tesla battery they are 4 times the capacity of a Leaf and a quarter of the price.
The question is where would you put the second battery ?

Left and right where the side skirt would go… actually making side skirt with the battery itself.
I saw videos of Tesla battery they don’t catch fire and in case of collision I guess they would simply scatter all over…