Regardless of price, they do what they're supposed to do. I accidentally bought two but don't worry I have a different box to use. Some people on Youtube complain that the box they use is too small. One guy had 10 batteries and his charger in one and when he put the styrofoam in he said he could probably only fit 5 or six and maybe the charger. I'm not a pro so I don't have a lot of batteries. This foam allowed me to carry three 5Ah batteries and to tow 2Ah batteries (one attached to the drill) and my drill. I have another case with an impact wrench that has a charger and a spare battery so I'm fine with that. You need a long blade to cut them, a utility knife will not do. I'm very happy with how it turned out for me. As you can see from my photos, they stay in place even when held at an angle downwards.
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