Is there a 5 V rechargeable battery and cables compatible and comparative in size with Raspberry Pi Zero?
I don't want to have to plug my Raspberry Pi in every time and nonrechargables get expensive. Power banks seem so much bigger than the Zero and aren't viably wearable.
Update: I plan to put a bounty on this question soon, so I would like to clarify a bit more so as to fit the rules. I am not trying to ask for shopping advice, although an adafruit link would be nice. I am just wondering compatibility and what is out there. If you would like me to target a specific battery, I could reword the question as "How can I power my Raspberry Pi Zero with a Samsung Galaxy battery", but I thought there would be a better source. Please let me know how I can fit the rules even more. The answers given are good except many do not include the cables/connectors needed to use them.