Hi guys, nice product! Can we stack it up with another UPS or battery stack? I want to increase uptime...

Hello, our product department evaluated this product in your link.
This is a general-purpose mobile power, the technology is relatively mature, there are a lot of similar, in fact, similar to the charging treasure, so the price is cheaper, but the volume is generally larger, unlike the Raspberry Pi 5 UPS, is designed specifically for the Raspberry Pi 5, compact size, support for the output of 5V/5A, and belongs to the secondary design of the product, used in the design of the project will not take up too much space.

However, the product department is internally discussing whether to adjust the price of this UPS, thank you very much for your feedback!