your battery is fine. it is possible that you did not install the replacement fuse correctly, or that there is a short circuit that blows the fuse when you put one in (?)

it is also very possible that something is wrong with your controller. You may need to replace it, or, if you're good with electronics you may be able to repair it. If you have a multi-meter that would help you to figure out what is wrong with the bike.

The maker of your bike will know more, if you can get in touch with them. You also may be able to get help at http://endless-sphere.com/forums