Over time, the Nissan Leaf traction battery (the big one) will store less energy.  You can upgrade to a new car, or, as of 2023, there is an option to swap in a used (but newer) traction battery.  This is a non-trivial operation requiring a battery hoist, and likely hardware and software kits.  For reference (just a general guide - there is overlap):

            - 24 KWH - 2011 to 2012 (Japanese Build)
            - 24 KWH - 2013 - 2015 (US Build)
            - 30 KWH - 2016 - 2019
            - 40 KWH - 2020 - 2021
            - 62 KWH - 2022 - present

So, what s the best battery to select for an upgrade ?  Is there a sweet spot ?  It turns out, that for many reasons, the 40 KWH battery is the best choice.​
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1. EV's were taking off in popularity in 2020 and 2021, so there were lots of cars with 40 KWH batteries.  As folks are in accidents and the cars written off, they are quite available at a reasonable price
2. The 62 KWH is too new and is much more expensive and because of the pandemic, the annual number made was much lower than the 40 KWH).  The 62 KWH battery does store more, but there are downsides.  It weights 250 lbs more than the 40 KWH and your ground clearance is reduced (fatter battery).
3. The 24 KWH and 30 KWH are much older and probably have too much wear and tear to make the trade make sense.
4. A 40 KWH battery from 2020/2021 is only 2-3 years old.  It therefore should be in good shape.  Aim for a 11 or 12 bar battery.

For more information, contact Julian at Motorize Electric Vehicles (best info ?)

Put other swap option places like Precision Auto (?) and Tom bla bla (?) and ....