Battery Pack for Raspberry Pi, 4000mAh, Adhesive

Works like the other one I bought but this one has a basic limited power at 4,000 mAh. I guess battery capacity depends on that number... BUT it works as a reliable small temporary power source for Raspberry Pi or other 5V devices. I forgot what I got it for I think to test all the components I have but switched to the other 10,000 mAh I have and am using more. Still I'm testing these things so I need to try them out more.It works and charges fine for me and is very useful. The suction also holds well and is a pretty useful add on.

This battery works great. I use it with the Raspberry Pi 3B+ purchased with the Canakit Ultimate. I have to admit to a mistake when I first used it. I charged the battery, plugged in into the Pi and noticed only a faint red light as compared to the much brighter light when I plug Pi into AC adapter. I concluded the battery was under-powered for the Pi. But the real problem was that I hadn't pushed the battery "on" button, which is rather inconspicuous. Once I did that, the Pi indicator light turned as bright as it does when plugged into its AC adapter and the Pi functioned well. I felt a little foolish that I hadn't seen the button initially.

This is a great little battery pack that nicely suctions to my phone so that it feels like one cohesive unit, rather than having a jumble of cords and awkwardly shaped portable chargers to manage. I like that it comes with a protective carrying bag so that I don't have to worry about it in my purse. It's an effective charger. From one charge I was able to power my phone about 1.75 times.

Has worked well with all my devices. Comes with a nice case and has a grip side that makes it easier to carry with your phone.

I have this plugged directly into my Raspberry Pi and the power adapter is plugged into this. It has been running in this configuration for two months without any issues. Before, when I had the power adapter plugged directly into the pi, I had created simple power backup strategy with super capacitors, diodes and a few resistors, but kept running into low power issues. This resulted in needing scripts to reactivate wireless due to slight power blips.This is a much cheaper and easier way to provide a simple UPS for a raspberry pi. The footprint is slightly wider than a pi, but since I do not use a standard pi case, it doesn't bother me. I will definitely buy one for each of my other pi's.

I bought this as a cheap UPS alternative for my RasPI device. Does it power the unit and charge at the same time? Yes. But, if you cut power to the battery, the device also loses power. There is a switching time (a couple of seconds) before the device can start drawing power from it.

I bought this as a small power source for the pi on my robot and it worked great. Only small issue is I wish the build in cable was about 1-2cm longer so I could stack them without another cable.

I love these batteries they can even Quick charge my phone. I use them on the go for my phone tablet & Raspberry Pi 3 B+