UPS V5 Power Supply Uninterruptible UPS HAT for Raspberry Pi, Support 18650 Battery Charger Power Bank Power Management Expansion Board 5V for Raspberry Pi 5/4B/3B+/3B/2B/B+/B/A+/A

I wish I could recommend this. The intended feature set really appeals to me, the included RTC is nice, and the stackable design that goes under the Pi and connects via pogo pins is really cool. The board feels as heavy as you'd want a power supply board to feel. I like the dual power inputs and the bonus power outputs and the power monitoring over I2C. I received version 5.1 PCB02b dated December 11th of 2011. The listing in the UAE still says this is compatible with the Pi 5, although it doesn't say that on the manufacturer website or in other countries' listings. Careful!Sadly, it looks like the manufacturer doesn't care about the many problems with this design. This board will charge LiPo cells to 100%, and the configuration to set a max charge voltage doesn't work. The manufacturer's comments on their Github are dismissive, like this isn't one of the most important aspects of a good UPS design. Holding the cells at max charge is terrible for the batteries, and most use cases for a UPS would benefit from a configurable maximum for increased battery longevity.The board has undergone a few revisions, but this hasn't been fixed. As a matter of fact, even the actual firmware doesn't seem to have been updated since sometime in 2021. The firmware itself is not even hosted on their GitHub, so I can't be 100% sure of anything about the firmware. Which is closed-source, it's not like the nerds back home who actually care about it are given the chance to fix anything. The intended way to update the firmware is to use the manufacturer's script that will download it from their website directly and flash it onto the UPS board. You can't (or aren't intended to) flash it yourself. This isn't a problem but it is weird and can be a liability. What if I need to roll back the version because someone uploaded a buggy or malicious version to their servers? etcI've also seen comments on their GitHub about the device not charging back up after a full discharge if auto-start on AC is enabled. Basically, it might not let you wait until the batteries charge up enough to auto-start the Pi, making it turn on and off because of insufficient power instead of powering on after reaching a stable level. Another silly oversight, frankly ridiculous.Another note: The IP5328 chip is mounted right opposite one of the batteries, which is a questionable compromise. Batteries can be dangerous! Simmering them over low heat is not the way to use them. I don't mind sticking on my own little heatsinks where they seem needed, but I can't say this decision fills me with confidence.The Pi 5 on the listing is also very strange. The Pi 5 notoriously needs 27W of juice, and this board clearly has all the power inputs labeled with 20W or 10W. No word on the maximum output power through the pogo pins. But this has Pi 5 in the title. Another bad sign.None of these things are necessarily dealbreakers if you want this to be an emergency backup and not a battery solution for spotty power. But I'm really disappointed, and I haven't decided if I'm going to just return it out of principle, because I don't want to reward the manufacturer for their oversights. I don't think it will set my apartment on fire, but the fact that I have to think about it can't be good. Sadly, it looks like all the small form factor UPS boards have some sort of issue. Very frustrating.In conclusion this is so close to being a perfect UPS for a Pi 4. But the manufacturer has decided to sell it in this incomplete state instead of making the definitive Pi 4 UPS. Or even the definitive Pi 4 and 5 UPS.