Cheap bracket, unusual Battery size

Actually, it is a bright, good to be recognized taillight. But unfortunately the batteries Size (LR1 Lady) is somewhat atypical. The batteries are used up too fast, too expensive and can not be recharged. Fortunately this problem with the newer version (Cuberider2) was removed from the world.
One can only hope that even some point the "rubber ring holder" is revised.
For me, there have been two major reasons the backlight to bring back.