This charging stand was designed (by request) to hold up to six batteries so they can be charged in one place without having them laying all over the counter and without having the cables tangled quite as easily. It is designed for round-ish backup batteries up to 26mm in diameter - if your battery packs are a different size, feel free to scale this as needed to fit what you have. This charging stand also has drain holes in the bottom since it was destined to be placed on a kitchen counter.