This is the UPS module housing I purchased from Alibaba: a 15W 3A 18650 lithium battery charging module, DC-DC booster, and UPS uninterruptible power supply -https://s.click.aliexpress.com/e/_Eue6MmZ

I remixed the original model and made a few improvements to it. Here is the list of changes:

- It increases the space inside the enclosure, so you don't have to forcefully install the module in the enclosure. If you need to make some modifications

- The amount of material at the top and bottom has been increased, so it won't bend excessively and is safer to use

- Beveling has been added to the edges.

- The size of the required holes and screws has been reduced, so there is more material around the screws to provide a better fixation.

-Removed unnecessary internal voids to make it more sturdy.

Materials list:

2.5 mm x 14/16/18 mm self-tapping screws