Swapping a 2011 24 kWH Nissan Leaf battery in my driveway

I'm swapping batteries on my Nissan Leaf in my driveway. I'll be learning a lot in the process. 

I'm based in Wellington, New Zealand.

I have a 2011 Nissan Leaf with a 24 kWh battery at 57% State of Health. That gives me around 70 km of range.

I've bought a replacement 2015 24 kWh battery at 77% State of Health for NZ$2800, free delivery. Ideally I'd swap in a 40 kWh battery but those are selling for much higher prices and also require replacing the suspension springs as they are a heavier battery.

This project will be a low cost low risk step that will teach me how to do Leaf battery swaps. Once I've done this one I'll feel more confident investing in a larger battery in future.

The other main cost was an EVs Enhanced Battery Translator Kit for NZ$900. This fits between the battery communications port and the car. It translates some of the CAN bus messages on the fly so that the car thinks it still has the same battery, but with more capacity. The kit also has the obscure Leaf battery comms connectors.

There is an open source solution that I was tempted to go for but as I want keep my risks as low on this first batter swap. If all goes smoothly this time then I might experiment with the open source solution next time.

For me the biggest challenge is physically handling a 273 kg battery on my gravel driveway. (It would be much easier on a concrete driveway.)

I've created a list of tools and procedure steps (based on Dala's): https://docs.google.com/document/d/1gO57B26e0v9U9A-j49Rapkw_1taFstW5tgxqECkpKKo

And I designed some covers for the empty sockets on the swap battery - just to keep stuff out of the connectors: https://www.myminifactory.com/object/3d-print-nissan-leaf-hv-battery-connector-covers-372497