2 of the 20 had separated lids. I can survive that loss. But when 4 AA rechargeable batteries are locked in the case, it is very difficult if not impossible to open. Closing the case so that it clicks shut takes a lot of pressure too. Not sure that I would recommend this to anyone over 60. or anyone that can not put a lot of pressure with their fingers.
AAA batteries are fine, the case opens and closes very easily.
Sorry