Built this battery for my bike using parts from Woodniu. Seems to be working well so far...
Woodniu store...
https://www.aliexpress.com/item/1005003255249529.html?spm=a2g0o.order_list.0.0.21ef1802QYuI5H
That's a nice upgrade and didn't look to be to challenging to build. I can see me getting a new battery in the future, maybe even going to 96V nominal and this looks like a good way to go about it.
Still going strong over 1500 miles later! Here's some pictures...