Strap around battery compartment

I've noticed a lot of pics with a Velcro strap around the battery compartment. Is the battery door problematic or are people just doing this a precaution?
JT
 
Precaution here. Will help keep battery inside compartment in case of spill.Handy when bike is on car rack to keep door closed.
 
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My stromer battery door is rattle free and problem free.. no straps needed. In fact i forget that it's even there!.
 
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