Confirmed: Nissan dealership upgraded my 2016 Leaf 30 kwh battery to a 40 kWh battery after my 30 kwh battery failed (lost 4 bars within the warranty period)! I have a 2016 Nissan Leaf with 43,000 miles on it. I recently lost the 4th battery bar and therefore took it into the dealership for a replacement. They confirmed I needed a new battery and that the warranty would cover it. They told me it would take a few days for the battery to ship and to be installed. Gave me a loaner carin the meantime. A week later, they called me and told me the new battery was installed. The service rep then informed that they installed a 40kwh battery! He was just as shocked as I was. He told me they stopped making the 30 kwh battery and so that's why I received the upgrade. Now I don't know if this service rep new for sure they stopped making the 30 kWh battery, but those were his exact words. Seems fishy. That would mean anybody with a pre 2018 leaf could get an upgrade if their battery failed under the warranty or just decided to purchase a new battery. But anyway, I'm pretty freaking pumped. When I got in my car after the install, indeed, I had full bars and a 162 mile range on my 2016 Nissan leaf! Cheers all.