Wow, how much shorter is it than the original battery?
Also someone needs to make 2 seperate 160wh Batteries that clip together to make one in the bike.
As you are not allowed to take batteries over 160wh on planes but you are allowed to take 2 seperate 160wh batterie.
Maxxis WT 2.5" are perfectly fine with 29mm rims. As are the 2.6". I wouldn't let rim width be the determining factor between picking between them. It's the smaller non-WT Maxxis that start to run a bit square, with side knobs engaging to early, from 30mm and up.