Excellent research, particularly for a new member (welcome!)!The Nissan CIMA is the JDM version of a Infiniti q70 hybrid that has been sold stateside since 2014.
According to the Infiniti First Responders Guide, it has:
Li-ion battery voltage 346V (400V max.)
Number of Li-ion battery modules in the pack 12
Li-ion battery module voltage 28.8V each
Li-ion battery dimensions 33.35 x 17.83 x 15.43 in. (847 x 453 x 392 mm) 121.28 lbs (55 kg)
The next step is to find one for parts!
Edit: the Infiniti M35h used the same battery beginning in 2012. Also according to the Infinity First Responders Guide.
Double Edit: so did the Q50.
I looked into the available donor Infiniti vehicles. Unfortunately, there are only a handful available and they're expensive! Looks like I'm back to contemplating the 4S1P Leaf option.