Review on MakerHawk Raspberry Pi UPS Power Supply Uninterruptible HAT with Battery Charger Power Bank & Management Expansion Board 5V for Raspberry Pi 4 Model B / 3B + / 3B (Battery Excluded) by Tia Campbell

This UPS power supply for Raspberry Pi works great. This way you can run your Pi with a pair of 18650s and charge [healthy] batteries without them exploding. It's usually easy to install. The hardest part of the installation is attaching the nuts to the metal studs on top of the Pi. You may need electric/small wrenches, but if you're careful you can do this with your thumb and forefinger. If I had to complain about anything, I would probably complain that the power button isn't as reliable as I'd like it to be. If you are working with a hat display, you may need to hold down the power button to turn off the device completely. A real power toggle switch with a button to check battery charge would be much better in my opinion. Also, after installing the plexiglass screen, it's quite a hassle to change the batteries. It only takes four screws to remove the plexiglass screen, but you won't take 2 minutes to change batteries and care must be taken not to lose these screws. Other than that, this item is awesome! I recommend it as value for money due to the portability and convenience it offers.