SUPPORTS REQUIRED ON SOME PRINTERS This is yet another battery holder. it's dewalt this time, the easiest one to design. this one works the same as all the others, line it up against a wall, screw it in (use a drill for pilot holes if you want) and clip in your battery. the reason these battery holders are useful is because if you leave them on the charger it degrades quite quickly and if you leave the connection exposed accidents can happen, stuff could scratch it or dust can interfere with the connection. It also helps when you have more chargers than batteries. as always, Happy printing!