Originally Posted by LasagnaCat

The TOP strap will work, but can very easily add tweak to your ride. The Puretech Xtreme strap is a much better fit, holds the battery snug while being a bit free at the same time. The TOP strap tends to bind and is easy to pull too tight. The Puretech strap is also thinner and more flexible. The 5 inch strap fits perfectly in a TC6.

http://www.puretechproducts.com/ptprod_straps.htm

(Tape is just... icky.)