I did the same thing and it helped a bit, but I still have problems. I did find the tray from a Rouge and hold down fit in the Leaf and the battery is a 34N. Here is my write upviewtopic.php?f=9&t=18129&p=439206#p439206
Regarding that older topic, I'm wondering how the larger PbA battery is holding up after almost two years now. And has the intermittent 800ma battery drain ever been found?
Also, back in 2014, Nubo wrote "My choice for this application was the Sun-Xtender PVX-420T." So I'm wondering if there is a long-term update possible. I'm also interested, because that is an excellent battery, and I'm wondering how it would compare to an Optima, which is probably a bit more expensive.
I am still on the original 12V in the 2011 LEAF, so now almost six years old and in the heat of Florida, and I have to say I think it has been excellent. (I also like the original Ecopia tires and got 45K miles from them, but that's another topic.)