This case holds 25 LiPo batteries which I use for my Tiny Whoop. The batteries can slide in either way so for example you could put your drained cells in upside-down.
Fits normal 1S ~200 mAh LiPos and up through the 250 mAh cells. Also fits cells with micro JST and also the larger JST-PH connectors.
There are two tops available. One is a sloppy fit but does not fall off. The second is a snug fit and takes some effort to pop on and off. The second is super secure.
The author hasn't provided the model origin yet.