Is the battery held on by bungee cords? You can buy a 1" board and paint it black or red to match your bike and then attach that to the top tube with hose clamps and then screw your shark battery into that 1" board to clean up that look and secure that battery a bit more.
1" board = $1.50 (like 4 feet)
2x hose clamps = $3.00
Utility black spray paint = $1.00
