These straps recommended by the shop to keep the universal battery in place. Perfect fit and easy to sue/undo etc. Unobtrusive and keeps the battery snug.
I quite glad that these replacement parts are available, as the existing one broke down on my trolley
There are 2 thin straps on every pack, perfect for when the straps on your trolley break and you need to replace them. I've used them for half a year and they still hold up very well.
