Pisugar Portable Power Module with 1200 mAh Lithium Battery for Raspberry Pi-Zero Power Supply, Board Kit W/WH Model Accessories (Not Include Raspberry Pi) (1200 mAh)

This is a brilliant little "all in one" battery for Raspberry Pi projects, you don't even need solder, you can power just by pressing it (there are small plastic screws included to attach) to the bottom of the pi. It lets you charge while using, use as a totally wireless device, has an on-off switch (press for on, double press for off) and 4 leds that indicate battery charge level.Mine took about 4 weeks to arrive as I think the unit comes from China, but apart from that, no issues at all.

That the board is the same form factor as the pi zero is really nice, and the connectors transferring power without a cable is cool. Generally really nice and happy. Delivery was much quicker than advertised too, which was handy. Downsides though are that the battery life is not great, so seems better suited to a UPS role than running remote from a power socket. The battery is held on to the board by a magnet which seems flexible in theory but actually with the short wires seems more of a gimmick and the longevity of the wired connection concerns me though I've not had any actual issues. Access to the switch is fiddly. I purchased version 1 on reading reviews reporting quality issues with version 2, and I see there is a version 3 on it's way. The issue here for me, is that the distinction between the versions is not clear on github.