Review on 🔋 SunFounder Power Supply Module for Raspberry Pi UPS with Rechargeable 5V/3A Lithium Battery Pack Expansion Board, Compatible with Raspberry Pi 4B 3B+ 3B/2B and 1 Model B+, Battery Not Included by Paul Rose

Works great! It was very easy to assemble (less than 5 minutes) and surprisingly didn't add weight to the Pi as I expected. Now I just need to figure out how to reconnect my fan to it! A few pointers: do not insert the batteries according to the markings in the slots (it shows they are parallel, + top on either side), instead insert them according to the markings on the board itself (+ top and - top ). I didn't notice the other markings at first and thought my board was bad when it didn't turn on. The included batteries are fine, but cannot power the Pi when overclocked. The capacity isn't great either, so I'd recommend higher quality batteries. As other reviewers have noted, it doesn't charge batteries, so make sure you have an 18650 charger with you. I'd recommend using a short, right-angle USB cable. instead of the one supplied because it sticks out quite a bit and I'm afraid it might collide and possibly damage the connector on the Pi. Indeed, for the price, this is a wonderful little battery.