On the used market you'll find absolutely cooked (literally) Leafs whose first life was in Arizona and barely have enough range to back out of the driveway.
Is there any value in fixing the battery on these? IE: Do the other components last long enough to be worth the cost?
It seems like procuring the battery is not as expensive as the Tesla battery (I see someone who did it themselves for $6k on Youtube with the battery from a wrecked leaf). In comparison, the cost I see for my Model 3 is about ~$18k CAD.
Getting a car up and running for $8k might be worth it if it is otherwise dependable, but I've only heard unfortunate stories about the first gen Leaf.
Is it worth spending money on a car that old? You are putting more than the car is worth into fixing it and you won't get that back if you sell. You also have no idea when/if something else will go. thew worst case is the day after you fix it someone hits you and the repairs will be $30,000 - what it cost new and there are still a lot of worn out parts: insurance will give you $4000 and tell you to eat the loss.
30k is the real cost to repair some accident damage to a leaf - think bent frame. this could happen anytime. Nobody would pay that price to the whole car ends up in a junk yard.
I use it in my driveway to make it look to thieves like someone is home (round me, houses with no car get broken into).