This is a mini laptop based on Raspberry Pi 5, quite compact (but not quite)

boom:
power bank board:
https://sl.aliexpress.r
u/p?key=opFGGtX

keyboard:

https://aliexpress.ru/item/33004421930.html?sku_id=12000018019339157&spm=a2g2w.productlist.search_results.4.4cbe7f52WaweTi

Raspberry Pi 5: any

and two similar batteries (I couldn’t find any similar to mine):

https://sl.aliexpress.ru/p?key=4eFGG6a