This 9Volt blocks are not as widespread as round cells. Therefore, they are having a bearing date to 2016 probably not as fresh as the same time ordered R6 cells. So far there is no premature failure. Unfortunately, I realized in this construction that it does not fit in in all my instruments and remote control of garage door, because the side edges are less round in the lithium blocks. However, this rounding is present in the battery compartments and lids. As such, they are the conventional alternative.
