Why just first batch? Please request for Banggood/Astrolux to stop using glue on all of their flashlights. The majority of their customers are flashlight hobbyists and many would like to be able to mod their flashlights.
Aside from modding, if the manufacturer wants to glue the light shut they should assume all servicing at their expense, centering led’s, removing dust from reflectors, cleaning fingerprints inside the lens, etc.