What is the battery weight of the Nissan Leaf 62 kWh?
According to PUSHEVS, the specs of the 40 kWh and 62 kWh batteries are:-

40 kWh battery

Total battery capacity: 39,46 kWh
Usable battery capacity: 36 kWh (91 %)
Battery weight: 303 kg
Battery energy density: 130 Wh/kg
Cells: 192 (96s2p)
Chemistry: NCM 523
Manufacturer: Envision AESC
TMS: passive air cooling


62 kWh battery

Total battery capacity: 62 kWh
Usable battery capacity: 56 kWh (90 %)
Battery weight: 410 kg (estimation)
Battery energy density: 151 Wh/kg (estimation)
Cells: 288 (96s3p)
Chemistry: NCM 523
Manufacturer: Envision AESC
TMS: passive air cooling


If these figures are accurate then the weight scales up by ~87% of the capacity. However this may just be an artifact of how the 62 kWh battery weight was estimated. 

Another (possibly less accurate but more reliable) measurement could be taken from the difference in curb weights between the 40 kWh and 62 kWh models, which is 1729 kg - 1573 kg = 156 kg more for the SV+ vs SV. Based on that the 62 kWh battery is 51% heavier, so it scales at 98% of the capacity (ie. almost 1:1).