About this 3D model

I saw a weather clock e-ink reader on Open Source Hardware (https://oshwhub.com/jie326513988/SDka-mo-shui-ping-yue-du-qi) designed by @甘草酸不酸 and it is quite nice. I replicated one, but during use, I found that although deep sleep was used, the original shell could only hold a lithium battery and it needed to be charged every month. To get rid of the anxiety of battery life and make full use of existing resources, some adjustments were made to the original shell, adding a place for a 21700 battery. If you are interested, feel free to use it.